Browsers automatically append cookies to every HTTP request made to the site that sets the cookie. Cookies might store sensitive data such as session ID and authorization token or site data that is shared between different requests to the same site during a session. An attacker can perform an impersonation attack by generating a request to the authenticated site from a third-party site page loaded on the client machine because the browser automatically appended the cookie to the request.

The SameSite parameter limits the scope of the cookie so that it is only attached to a request if the request is generated from first-party or same-site context. This helps to protect cookies from Cross-Site Request Forgery (CSRF) attacks. The SameSite parameter can have the following three values:

- Strict: When set to Strict, cookies are only sent along with requests upon top-level navigation.
- Lax: When set to Lax, cookies are sent with top-level navigation from the same host as well as GET requests originated to the host from third-party sites. For example, suppose a third-party site has either iframe or href tags that link to the host site. If a user follows the link, the request will include the cookie.
- None: Cookies are sent in all requests made to the site within the path and domain scope set for the cookie. Requests generated due to form submissions using the POST method are also allowed to send cookies with the request.

Example 1: The following code sets the SameSite attribute to None for session cookies.

...
Cookie cookie = new Cookie('name', 'Foo', path, -1, true, 'None');
...

Browsers automatically append cookies to every HTTP request made to the site that sets the cookie. Cookies might store sensitive data such as session ID and authorization token or site data that is shared between different requests to the same site during a session. An attacker can perform an impersonation attack by generating a request to the authenticated site from a third-party site page loaded on the client machine because the browser automatically appends the cookie to the request.

The SameSite attribute limits the scope of the cookie such that it will only be attached to a request if the request is generated from first-party or same-site context. This helps to protect cookies from Cross-Site Request Forgery (CSRF) attacks. The SameSite attribute can have the following three values:

- Strict: When set to Strict, cookies are only sent along with requests upon top-level navigation.
- Lax: When set to Lax, cookies are sent with top-level navigation from the same host as well as GET requests originating from third-party sites, including those that have either iframe or href tags that link to the host site. If a user follows the link, the request will include the cookie.
- None: Cookies are sent in all requests made to the site within the path and domain scope set for the cookie. Requests generated due to form submissions using the POST method are also allowed to send cookies with request.

Example 1: The following code disables the SameSite attribute for session cookies.

    ...
    CookieOptions opt = new CookieOptions()
    {
        SameSite = SameSiteMode.None;
    };
    context.Response.Cookies.Append("name", "Foo", opt);
    ...

Browsers automatically append cookies to every HTTP request made to the site that sets the cookie. Cookies might store sensitive data such as session ID and authorization token or site data that is shared between different requests to the same site during a session. An attacker can perform an impersonation attack by generating a request to the authenticated site from a third-party site page loaded on the client machine because the browser automatically appended the cookie to the request.

The SameSite attribute limits the scope of the cookie so that it is only attached to a request if the request is generated from first-party or same-site context. This helps to protect cookies from Cross-Site Request Forgery (CSRF) attacks. The SameSite attribute can have the following three values:

- Strict: When set to Strict, cookies are only sent along with requests upon top-level navigation.
- Lax: When set to Lax, cookies are sent with top-level navigation from the same host as well as GET requests originated to the host from third-party sites. For example, suppose a third-party site has either iframe or href tags that link to the host site. If a user follows the link, the request will include the cookie.
- None: Cookies are sent in all requests made to the site within the path and domain scope set for the cookie. Requests generated due to form submissions using the POST method are also allowed to send cookies with the request.

Example 1: The following code disables the SameSite attribute for session cookies.

c := &http.Cookie{
  Name: "cookie",
  Value: "samesite-none",
  SameSite: http.SameSiteNoneMode,
}

Browsers automatically append cookies to every HTTP request made to the site that sets the cookie. Cookies might store sensitive data such as session ID and authorization token or site data that is shared between different requests to the same site during a session. An attacker can perform an impersonation attack by generating a request to the authenticated site from a third-party site page loaded on the client machine because the browser automatically appends the cookie to the request.

The SameSite attribute limits the scope of the cookie so that it is only attached to a request if the request is generated from first-party or same-site context. This helps to protect cookies from Cross-Site Request Forgery (CSRF) attacks. The SameSite attribute can have the following three values:

- Strict: When set to Strict, cookies are only sent along with requests upon top-level navigation.
- Lax: When set to Lax, cookies are sent with top-level navigation from the same host as well as GET requests originating from third-party sites, including those that have either iframe or href tags that link to the host site. For example, suppose there is a third-party site that has either iframe or href tags that link to the host site. If a user follows the link, the request will include the cookie.
- None: Cookies are sent in all requests made to the site within the path and domain scope set for the cookie. Requests generated due to form submissions using the POST method are also allowed to send cookies with the request.

Example 1: The following code disables the SameSite attribute for session cookies.

app.get('/', function (req, res) {
    ...
    res.cookie('name', 'Foo', { sameSite: false });
    ...
}

Browsers automatically append cookies to every HTTP request made to the site that sets the cookie. Cookies might store sensitive data such as session ID and authorization token or site data that is shared between different requests to the same site during a session. An attacker can perform an impersonation attack by generating a request to the authenticated site from a third-party site page loaded on the client machine because the browser automatically appended the cookie to the request.

The SameSite attribute limits the scope of the cookie such that it will only be attached to a request if the request is generated from first-party or same-site context. This helps to protect cookies from Cross-Site Request Forgery (CSRF) attacks. The SameSite attribute can have the following three values:

- Strict: When set to Strict, cookies are only sent along with requests upon top-level navigation.
- Lax: When set to Lax, cookies are sent with top-level navigation from the same host as well as GET requests originated to the host from third-party sites. For example, suppose a third-party site has either iframe or href tags that link to the host site. If a user follows the link, the request will include the cookie.
- None: Cookies are sent in all requests made to the site within the path and domain scope set for the cookie. Requests generated due to form submissions using the POST method are also allowed to send cookies with request.

Example 1: The following code disables the SameSite attribute for session cookies.

ini_set("session.cookie_samesite", "None");

Browsers automatically append cookies to every HTTP request made to the site that sets the cookie. Cookies might store sensitive data such as session ID and authorization token or site data that is shared between different requests to the same site during a session. An attacker can perform an impersonation attack by generating a request to the authenticated site from a third-party site page loaded on the client machine because the browser automatically appended the cookie to the request.

The samesite parameter limits the scope of the cookie so that it is only attached to a request if the request is generated from first-party or same-site context. This helps to protect cookies from Cross-Site Request Forgery (CSRF) attacks. The samesite parameter can have the following three values:

- Strict: When set to Strict, cookies are only sent along with requests upon top-level navigation.
- Lax: When set to Lax, cookies are sent with top-level navigation from the same host as well as GET requests originated to the host from third-party sites. For example, suppose a third-party site has either iframe or href tags that link to the host site. If a user follows the link, the request will include the cookie.
- None: Cookies are sent in all requests made to the site within the path and domain scope set for the cookie. Requests generated due to form submissions using the POST method are also allowed to send cookies with the request.

Example 1: The following code disables the SameSite attribute for session cookies.

  response.set_cookie("cookie", value="samesite-none", samesite=None)

The SameSite attribute protects cookies from Cross-Site Request Forgery (CSRF) attacks. The browser automatically appends cookies to every HTTP request made to the site that sets the cookie. Cookies might store sensitive data like session ID and authorization token or site data that is shared between different requests to the same site during a session. An attacker can perform an impersonation attack by generating a request to the authenticated site from a third-party site page loaded on the client machine because the browser automatically appended the cookie to the request.
The SameSite attribute on a cookie allows sites to control that behaviour and prevents browsers from appending the cookie to request if the request is generated from a third-party site page load. The SameSite attribute can have the following three values:

- Strict: When set to Strict, cookies are only sent along with requests upon top level navigation.
- Lax: When set to Lax, cookies are sent with top level navigation from the same host as well as GET requests originated to the host from third-party sites (for example, in iframe, link, href, and so on and the form tag with GET method only).
- None: Cookies are sent in all requests made to the site within the path and domain scope set for the cookie. Requests generated due to form submissions using the POST method are also allowed to send cookies with request.
Cookies that have the SameSite attribute with the value of None must be set with the Secure attribute otherwise the browser rejects the cookies. Additionally, a few specific browser versions reject the SameSite cookie with the None value for example, Chrome versions 51 to 66, versions of the UC Browser on Android prior to version 12.13.2, versions of Safari and embedded browsers on macOS 10.14, and all browsers on iOS 12 reject cookies set with SameSite=None. A suggested workaround for this issue is to set an alternate cookie with a prefix or suffix such as Legacy appended to cookiename. Sites can look for this legacy cookie if it does not find a cookie that was set with SameSite=None.

Browsers automatically append cookies to every HTTP request made to the site that sets the cookie. Cookies might store sensitive data such as session ID and authorization token or site data that is shared between different requests to the same site during a session. An attacker can perform an impersonation attack by generating a request to the authenticated site from a third-party site page loaded on the client machine because the browser automatically appended the cookie to the request.

The SameSite parameter limits the scope of the cookie so that it is only attached to a request if the request is generated from first-party or same-site context. This helps to protect cookies from Cross-Site Request Forgery (CSRF) attacks. The SameSite parameter can have the following three values:

- Strict: When set to Strict, cookies are only sent along with requests upon top-level navigation.
- Lax: When set to Lax, cookies are sent with top-level navigation from the same host as well as GET requests originated to the host from third-party sites. For example, suppose a third-party site has either iframe or href tags that link to the host site. If a user follows the link, the request will include the cookie.
- None: Cookies are sent in all requests made to the site within the path and domain scope set for the cookie. Requests generated due to form submissions using the POST method are also allowed to send cookies with the request.

Example 1: The following code sets the SameSite parameter to Lax for session cookies.

...
Cookie cookie = new Cookie('name', 'Foo', path, -1, true, 'Lax');
...

The SameSite attribute protects cookies from attacks such as Cross-Site Request Forgery (CSRF). Session cookies represent a user to the site so that the user can perform authorized actions. However, the browser automatically sends the cookies with the request and therefore users and web sites implicitly trust the browser for authorization. An attacker can misuse this trust and make a request to the site on behalf of the user by embedding links inside the href and src attribute of tags such as link and iframe in third-party site pages that an attacker controls. If an attacker is able to lure an unsuspecting user to the third-party site that they control, the attacker can make requests that automatically include the session cookie authorizing the user, effectively authorizing the attacker as if they were the user.
Set the value of the SameSite attribute to Strict in session cookies. This restricts the browser to append cookies only to requests that are either top-level navigation or originate from the same site. Requests that originate from third-party sites via links in various tags such as iframe, img, and form do not have these cookies and therefore prevent the site from taking action that the user might not have authorized.

Example 1: The following code sets the value of the SameSite attribute to Lax for session cookies.

    ...
    CookieOptions opt = new CookieOptions()
    {
        SameSite = SameSiteMode.Lax;
    };
    context.Response.Cookies.Append("name", "Foo", opt);
    ...

The SameSite attribute protects cookies from attacks such as Cross-Site Request Forgery (CSRF). Session cookies represent a user to the site so that the user can perform authorized actions. However, the browser automatically sends the cookies with the request and therefore users and web sites implicitly trust the browser for authorization. An attacker can misuse this trust and make a request to the site on behalf of the user by embedding links inside the href and src attribute of tags such as link and iframe in third-party site pages that an attacker controls. If an attacker is able to lure an unsuspecting user to the third-party site that they control, the attacker can make requests that automatically include the session cookie authorizing the user, effectively authorizing the attacker as if they were the user.
Set session cookies with SameSiteStrictMode for the SameSite attribute, which restricts the browser to append cookies only to requests that are either top-level navigation or originate from the same site. Requests that originate from third-party sites via links in various tags such as iframe, img, and form do not have these cookies and therefore prevent the site from taking action that the user might not have authorized.

Example 1: The following code enables SameSiteLaxMode in the SameSite attribute for session cookies.

c := &http.Cookie{
  Name: "cookie",
  Value: "samesite-lax",
  SameSite: http.SameSiteLaxMode,
}

The SameSite attribute protects cookies from attacks such as Cross-Site Request Forgery (CSRF). Session cookies represent a user to the site so that the user can perform authorized actions. However, the browser automatically sends the cookies with the request and therefore users and web sites implicitly trust the browser for authorization. An attacker can misuse this trust and make a request to the site on behalf of the user by embedding links inside the href and src attribute of tags such as link and iframe in third-party site pages that an attacker controls. If an attacker is able to lure an unsuspecting user to the third-party site that they control, the attacker can make requests that automatically include the session cookie authorizing the user, effectively authorizing the attacker as if they were the user.
Set the value of the SameSite attribute to Strict in session cookies. This restricts the browser to append cookies only to requests that are either top-level navigation or originate from the same site. Requests that originate from third-party sites via links in various tags such as iframe, img, and form do not have these cookies and therefore prevent the site from taking action that the user might not have authorized.

Example 1: The following code sets the value of the SameSite attribute to Lax for session cookies.

app.get('/', function (req, res) {
    ...
    res.cookie('name', 'Foo', { sameSite: "Lax" });
    ...
}

The SameSite attribute protects cookies from attacks such as Cross-Site Request Forgery (CSRF). Session cookies represent a user to the site so that the user can perform authorized actions. However, the browser automatically sends the cookies with the request and therefore users and web sites implicitly trust the browser for authorization. An attacker can misuse this trust and make a request to the site on behalf of the user by embedding links inside the href and src attribute of tags such as link and iframe in third-party site pages that an attacker controls. If an attacker is able to lure an unsuspecting user to the third-party site that they control, the attacker can make requests that automatically include the session cookie authorizing the user, effectively authorizing the attacker as if they were the user.
Set session cookies with Strict for the SameSite attribute, which restricts the browser to append cookies only to requests that are either top-level navigation or originate from the same site. Requests that originate from third-party sites via links in various tags such as iframe, img, and form do not have these cookies and therefore prevent the site from taking action that the user might not have authorized.

Example 1: The following code enables the Lax mode in the SameSite attribute for session cookies.

ini_set("session.cookie_samesite", "Lax");

The SameSite attribute protects cookies from attacks such as Cross-Site Request Forgery (CSRF). Session cookies represent a user to the site so that the user can perform authorized actions. However, the browser automatically sends the cookies with the request and therefore users and web sites implicitly trust the browser for authorization. An attacker can misuse this trust and make a request to the site on behalf of the user by embedding links inside the href and src attribute of tags such as link and iframe in third-party site pages that an attacker controls. If an attacker lures an unsuspecting user to the third-party site that they control, the attacker can make requests that automatically include the session cookie with user authorization. This effectively gives the attacker access with the user's authorization.
Set session cookies to Strict for the SameSite parameter, which restricts the browser to append cookies only to requests that are either top-level navigation or originate from the same site. Requests that originate from third-party sites via links in various tags such as iframe, img, and form do not have these cookies and therefore prevent the site from taking action that the user might not have authorized.

Example 1: The following code enables Lax in the samesite attribute for session cookies.

  response.set_cookie("cookie", value="samesite-lax", samesite="Lax")

The SameSite attribute protects cookies from attacks such as Cross-Site Request Forgery (CSRF). Session cookies represent a user to the site so they can perform authorized actions. However, the browser automatically sends the cookies and therefore user and web sites put an implicit trust on the browser for authorization. An attacker can misuse this trust and make a requests to the site on behalf of the user by embedding links inside the href and src attribute of tags such as link and iframe in third-party site pages that an attacker controls. With this, an attacker can trick an unsuspecting user to load this third-party site page in the browser while the user still has authorization to the site that the attacker intends to exploit.
Set session cookies with the Strict value for the SameSite attribute, which restricts the browser to append cookies only to requests that are either top level navigation or originate from the same site. Requests that originate from third-party site via links in various tags such as iframe, img, and form do not have these cookies and therefore prevent the site from taking action that the user might not have authorized.

Cross-Site WebSocket Hijacking occurs when a user is tricked into visiting a malicious site that will establish a WebSocket connection with a legitimate backend server. The initial HTTP request used to ask the server for upgrading to WebSocket protocol is a regular HTTP request and so, the browser will send any cookies bound to the target domain including any session cookies. If the server fails to verify the Origin header, it will allow any malicious site to impersonate the user and establish a bidirectional WebSocket connection without the user even noticing.

Use of unvetted dependencies can place an organization at risk of compromise.

A lack of audit records limits the ability to detect and respond to security related incidents and prevents forensic investigation.

Example 1: The following example template defines an Azure Monitor log profile that does not collect all Activity Log administrative events.

{
    "name": "string",
    "type": "microsoft.insights/logprofiles",
    "apiVersion": "2016-03-01",
    ...
    "properties": {
        ...
        "categories": [
            "Write"
        ],
        ...
    }
}