Vulnerability in Flagforge
CVE-2025-59843
Flag Forge is a Capture The Flag (CTF) platform. From versions 2.0.0 to before 2.3.2, the public endpoint /api/user/[username] returns user email addresses in its JSON response. The fix, intended for release in 2.3.1 but only available sta…
EPSS: 0.004 (30.8th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N.
Affected products
- Flagforge
- Flagforgectf Flagforge — versions >= 2.0.0, < 2.3.2
Weakness classification (CWE)
Public proof-of-concept exploits
References
- security-advisories@github.com (x_refsource_CONFIRM, Vendor Advisory)
- security-advisories@github.com (x_refsource_MISC)
- security-advisories@github.com (x_refsource_MISC)
- security-advisories@github.com (x_refsource_MISC)
Frequently asked questions
- What is CVE-2025-59843?
- CVE-2025-59843 is a medium-severity vulnerability in Flagforge, classified under Exposure of Private Personal Information to an Unauthorized Actor. CVSS score: 5.3/10. Published 2025-09-26.
- How severe is CVE-2025-59843?
- Medium severity. CVSS v3 base score is 5.3 out of 10.
- Is CVE-2025-59843 known to be exploited?
- 3 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.