CVE-2026-46556 flaskbb CVE debrief

Who should care

Users of FlaskBB, especially those with internal networks or cloud infrastructure, should be aware of this vulnerability. Authenticated users of FlaskBB may be able to exploit this vulnerability to access internal endpoints or trigger API calls.

Technical summary

The CVE-2026-46556 vulnerability is a Server-Side Request Forgery (SSRF) issue in FlaskBB, a Python forum software. The vulnerability exists in the get_image_info() function and allows authenticated users to force the server to send HTTP requests to arbitrary internal endpoints. This is a blind SSRF, meaning the attacker does not receive direct feedback on the success or failure of the request. However, it has been confirmed that this vulnerability can be used for internal port scanning and triggering internal API calls. The vulnerability has a CVSS score of 6.5 and a severity rating of MEDIUM.

Defensive priority

Medium priority should be given to patching this vulnerability, as it can be exploited by authenticated users to access internal endpoints or trigger API calls.

Recommended defensive actions

• Apply the patch by upgrading to FlaskBB version 2.2.1 or later.
• Restrict access to the get_image_info() function to prevent exploitation by unauthenticated users.
• Implement additional security measures, such as IP blocking or rate limiting, to detect and prevent SSRF attacks.
• Monitor internal endpoints and API calls for suspicious activity.
• Perform regular security audits and vulnerability assessments to identify potential issues.

Evidence notes

The CVE record was published on 2026-07-21T21:16:50.133Z and was last modified on 2026-07-22T16:17:23.673Z. The NVD entry is currently UNCHANGED. The vulnerability was reported by [email protected].

Official resources