CVE-2025-59843: medium-severity vulnerability in FlagForgeCTF flagForge
FlagForgeCTF Exposes User Emails via Public /api/user/[username] API
Published · Updated
E-mail alert when it lands in KEV, gets a public PoC or its score goes up.
13Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 6.9epss 0.4%
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.
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:L/SI:N/SA:N
Affected products
FlagForgeCTF · flagForgeRelated CVEs — FlagForgeCTF flagForge
In the same product, most dangerous first.
CVE-2025-61777CRITICALFlagForge Allows Unauthenticated Badge Template API AccessEPSS 0.5%CVE-2025-59841CRITICALFlagForgeCTF's Improper Session Handling Allows Access After LogoutEPSS 0.4%CVE-2025-59827HIGHFlagForgeCTF is Missing Authorization in main-v2EPSS 0.4%CVE-2025-59932HIGHFlagForgeCTF Unauthenticated Resource Modification/DeletionEPSS 0.4%CVE-2025-59833HIGHFlagForgeCTF Hint Exposure via APIEPSS 0.3%CVE-2026-21868HIGHFlag Forge has ReDoS Vulnerability in User Profile Lookup APIEPSS 0.3%
References
https://github.com/FlagForgeCTF/flagForge/commit/1b033f1b6e20fbf6df422d5d1afc9b2347528acehttps://github.com/FlagForgeCTF/flagForge/compare/v2.3.1...v2.3.2https://github.com/FlagForgeCTF/flagForge/releases/tag/v2.3.1https://github.com/FlagForgeCTF/flagForge/security/advisories/GHSA-qqjv-8r5p-7xpj