CVE-2026-46556 FlaskBB: SSRF in get_image_info() via unrestricted avatar URL
Authenticated users can exploit SSRF in FlaskBB to force server requests to internal endpoints, enabling port scanning and metadata access.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-46556?
CVE-2026-46556 is a medium-severity server-side request forgery vulnerability in flaskbb, published on 21 Jul 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official 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.
Weakness: CWE-918
Which versions are affected by CVE-2026-46556?
3 open source packages ship an affected version, including flaskbb.
| Package | Affected | Fixed in |
|---|---|---|
flaskbb PyPI | All versions to 2.2.0 | None |
flaskbb PyPI | All versions to 2.2.0 | None |
flaskbb PyPI | All versions to 2.2.0 | None |
How do I fix CVE-2026-46556?
No fix has been published for CVE-2026-46556 yet. Limit exposure of the affected software until one is available.
Upgrade, and send outbound requests through an allow-list that blocks internal addresses. More about Server-side request forgery.
Is CVE-2026-46556 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-46556 exists.
Sources
Also known as GHSA-xq32-9g7q-7297, PYSEC-2026-2479.