CVE-2025-59843
MediumCVSS 5.3Exploitation Probability (EPSS)
Low risk34th percentile - higher than 34% of all known CVEs
Summary
Flag Forge CTF platform versions 2.0.0 to before 2.3.2 expose user email addresses in the JSON response of the public endpoint /api/user/[username]. The fix, available from 2.3.2, removes emails from public API responses. No workarounds exist.
Risk Assessment
Exposure of email addresses can lead to phishing attacks or privacy violations.
Recommendation
Upgrade Flag Forge to version 2.3.2 or later to eliminate the data leak.
Other vulnerabilities in Flag Forge
See all- CVE-2026-21868High
Flag Forge versions 2.3.2 and below have a Regular Expression Denial of Service (ReDoS) vulnerability in the user profile API endpoint (/api/user/[username]). The application constructs a regular expression dynamically using unescaped user input (the username parameter). An attacker can exploit this by sending a specially crafted username containing regex meta-characters (e.g., deeply nested groups or quantifiers), causing the MongoDB regex engine to consume excessive CPU resources. This can lead to Denial of Service for other users. The issue is fixed in version 2.3.3. To workaround this issue, implement a Web Application Firewall (WAF) rule to block requests containing regex meta-characters in the URL path.
- CVE-2025-61777Critical
Flag Forge versions starting from 2.0.0 and prior to 2.3.2 had the `/api/admin/badge-templates` (GET) and `/api/admin/badge-templates/create` (POST) endpoints accessible without authentication or authorization. This allowed unauthorized users to retrieve all badge templates and sensitive metadata and/or create arbitrary badge templates in the database. The issue is fixed in version 2.3.2.
- CVE-2025-59932High
Flag Forge is a Capture The Flag (CTF) platform. From versions 2.0.0 to before 2.3.1, the /api/resources endpoint previously allowed POST and DELETE requests without proper authentication or authorization. This could have enabled unauthorized users to create, modify, or delete resources on the platform. The issue has been fixed in FlagForge version 2.3.1.
Original NVD description (English source)
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.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS