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 starting in version 2.3.2, removes email addresses from public API responses while keeping the endpoint publicly accessible. Users should upgrade to version 2.3.2 or later to eliminate exposure. There are no workarounds for this vulnerability.
EPSS: 0.004 (31.3th 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.