CVE-2021-21241

The Python "Flask-Security-Too" package is used for adding security features to your Flask application. It is an is a independently maintained version of Flask-Security based on the 3.0.0 version of Flask-Security. In Flask-Security-Too from version 3.3.0 and before version 3.4.5, the /login and /change endpoints can return the authenticated user's authentication token in response to a GET request. Since GET requests aren't protected with a CSRF token, this could lead to a malicious 3rd party site acquiring the authentication token. Version 3.4.5 and version 4.0.0 are patched. As a workaround, if you aren't using authentication tokens - you can set the SECURITY_TOKEN_MAX_AGE to "0" (seconds) which should make the token unusable.

• CWE-352

• https://github.com/Flask-Middleware/flask-security/commit/61d313150b5f620d0b800896c4f2199005e84b1fPatch, Third Party Advisory
• https://github.com/Flask-Middleware/flask-security/commit/6d50ee9169acf813257c37b75babe9c28e83542aPatch, Third Party Advisory
• https://github.com/Flask-Middleware/flask-security/pull/422Patch, Third Party Advisory
• https://github.com/Flask-Middleware/flask-security/releases/tag/3.4.5Third Party Advisory
• https://github.com/Flask-Middleware/flask-security/security/advisories/GHSA-hh7m-rx4f-4vpvThird Party Advisory
• https://pypi.org/project/Flask-Security-TooProduct, Third Party Advisory
• https://github.com/Flask-Middleware/flask-security/commit/61d313150b5f620d0b800896c4f2199005e84b1fPatch, Third Party Advisory
• https://github.com/Flask-Middleware/flask-security/commit/6d50ee9169acf813257c37b75babe9c28e83542aPatch, Third Party Advisory
• https://github.com/Flask-Middleware/flask-security/pull/422Patch, Third Party Advisory
• https://github.com/Flask-Middleware/flask-security/releases/tag/3.4.5Third Party Advisory
• https://github.com/Flask-Middleware/flask-security/security/advisories/GHSA-hh7m-rx4f-4vpvThird Party Advisory
• https://pypi.org/project/Flask-Security-TooProduct, Third Party Advisory

Published

Jan 11, 2021

Last Modified

Jun 17, 2026

Status

Modified