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

Severity: medium (CVSS 6.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.4% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-07-21 · updated 2026-07-23
Weakness: CWE-918

Description

FlaskBB is a Forum Software written in Python using the micro framework Flask. Prior to version 2.2.1, 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. This is a blind SSRF with confirmed internal port scanning and internal API triggering capabilities. Version 2.2.1 patches the issue.

Affected products

flaskbb: before 2.2.1

References

https://github.com/flaskbb/flaskbb/commit/e87e585f54bbe36694e91d52ee9b2d2e65dd4ab5
https://github.com/flaskbb/flaskbb/security/advisories/GHSA-xq32-9g7q-7297
https://github.com/flaskbb/flaskbb/security/advisories/GHSA-xq32-9g7q-7297

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