Vulnerability in Flagforge
CVE-2025-59841
Flag Forge is a Capture The Flag (CTF) platform. In versions from 2.2.0 to before 2.3.1, the FlagForge web application improperly handles session invalidation. Authenticated users can continue to access protected endpoints, such as /api/pr…
EPSS: 0.004 (31.3th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
Affected products
- Flagforge
- Flagforgectf Flagforge — versions >= 2.2.0, < 2.3.1
Weakness classification (CWE)
Public proof-of-concept exploits
References
- security-advisories@github.com (x_refsource_CONFIRM, Vendor Advisory)
- security-advisories@github.com (Patch, x_refsource_MISC)
Frequently asked questions
- What is CVE-2025-59841?
- CVE-2025-59841 is a critical-severity vulnerability in Flagforge, classified under Session Fixation. CVSS score: 9.8/10. Published 2025-09-25.
- How severe is CVE-2025-59841?
- Critical severity. CVSS v3 base score is 9.8 out of 10.
- Is CVE-2025-59841 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.