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CVE-2026-46556 flaskbb CVE debrief

CVE-2026-46556 is a Server-Side Request Forgery (SSRF) vulnerability 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 with confirmed internal port scanning and internal API triggering capabilities. The issue was patched in version 2.2.1.

Vendor
flaskbb
Product
Unknown
CVSS
MEDIUM 6.5
CISA KEV
Not listed in stored evidence
Original CVE published
2026-07-21
Original CVE updated
2026-07-22
Advisory published
2026-07-21
Advisory updated
2026-07-22

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].

Sources and references

Verified primary and authoritative sources

  • CVE-2026-46556 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-46556

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-46556 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-46556

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.