CVE-2025-59833: high-severity vulnerability in FlagForgeCTF flagForge
FlagForgeCTF Hint Exposure via API
Published
E-mail alert when it lands in KEV, gets a public PoC or its score goes up.
21Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 7.5epss 0.3%
Flag Forge is a Capture The Flag (CTF) platform. In versions from 2.1.0 to before 2.3.0, the API endpoint GET /api/problems/:id returns challenge hints in plaintext within the question object, regardless of whether the user has unlocked them via point deduction. Users can view all hints for free, undermining the business logic of the platform and reducing the integrity of the challenge system. This issue has been patched in version 2.3.0.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A: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-2025-59843MEDIUMFlagForgeCTF Exposes User Emails via Public /api/user/[username] APIEPSS 0.4%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-2026-21868HIGHFlag Forge has ReDoS Vulnerability in User Profile Lookup APIEPSS 0.3%