Auth bypass in Flagforge
CVE-2025-59827
Flag Forge is a Capture The Flag (CTF) platform. In version 2.1.0, the /api/admin/assign-badge endpoint lacks proper access control, allowing any authenticated user to assign high-privilege badges (e.g., Staff) to themselves. This could le…
Vulnerability class: Broken Access Control
EPSS: 0.003 (26.1th 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 — versions 2.1.0
- Flagforgectf Flagforge — versions = 2.1.0
Weakness classification (CWE)
Public proof-of-concept exploits
References
- security-advisories@github.com (x_refsource_CONFIRM, Vendor Advisory)
Frequently asked questions
- What is CVE-2025-59827?
- CVE-2025-59827 is a critical-severity vulnerability in Flagforge, classified under Missing Authorization. CVSS score: 9.8/10. Published 2025-09-24.
- How severe is CVE-2025-59827?
- Critical severity. CVSS v3 base score is 9.8 out of 10.
- Is CVE-2025-59827 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.