CVE-2026-46556: FlaskBB: SSRF in get_image_info() via unrestricted avatar URL

May 21, 2026

A Server-Side Request Forgery (SSRF) vulnerability in get_image_info() allows any authenticated user to force the server to send HTTP requests to arbitrary internal endpoints, including cloud metadata services (e.g., AWS 169.254.169.254). This is a blind SSRF with confirmed internal port scanning and internal API triggering capabilities. CVSS 6.5 Medium.

References

github.com/advisories/GHSA-xq32-9g7q-7297
github.com/flaskbb/flaskbb/security/advisories/GHSA-xq32-9g7q-7297
nvd.nist.gov/vuln/detail/CVE-2026-46556

Code Behaviors & Features

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