Machine-written summary
Summary written by Claude Haiku from the source advisory. Not reviewed by a person.
FlaskBB versions up to and including 2.2.0 are vulnerable to server-side request forgery through the avatar URL field. Any authenticated user can make the server send requests to arbitrary internal endpoints, including cloud metadata services, which can expose internal network details and, on cloud deployments, IAM credentials. The source lists no fixed version and no workaround.
Not analysed yet
We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.
Severity and exploitation
| Score | Rating | CVSS | Vector | Source |
|---|---|---|---|---|
| 6.5 | Medium | 3.1 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N | CNA (GitHub_M) |
- CISA KEV Not listed.
- EPSS 0.0035, the 29th percentile, on 14 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.
Timeline
- 31 Oct 2026, 15:02 UTC First seen by agentprime
- 31 Oct 2026, 15:02 UTC Confirmed by OSV