FlagForgeCTF Hint Exposure via API
Priority LOW 39CWE-200Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Information disclosure
- Confidentiality · integrity · availability
- High · None · None
- Fix status
- Fixed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-200.
Summary
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.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00346 28th percentileScored 2026-11-07
Fix Fixed flagForge (FlagForgeCTF): 2.3.0
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- Yes
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| FlagForgeCTF | flagForge | 2.1.0 to before 2.3.0 | 2.3.0 | Patch available | CNA |
- flagForge VendorFlagForgeCTF Affected 2.1.0 to before 2.3.0 Fixed in 2.3.0 Patch available CNA
CPE configurations NVD · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:flagforge:flagforge:*:*:*:*:*:*:*:* | 2.1.0 to before 2.3 | Vulnerable | FlagForgeCTF |
- cpe:2.3:a:flagforge:flagforge:*:*:*:*:*:*:*:* Versions 2.1.0 to before 2.3 Vulnerable ·FlagForgeCTF
Remediation
- Fix · CNA flagForge (FlagForgeCTF) Fixed in 2.3.0
Timeline
- 2026-10-02 Threatist record created from CVE-2025-59833
References
More FlagForgeCTF Flagforge vulnerabilities
- TI-2025-38170 FlagForge Allows Unauthenticated Badge Template API Access CVSS 3.1CRITICAL 9.4
- TI-2025-37280 FlagForgeCTF's Improper Session Handling Allows Access After Logout CVSS 3.1CRITICAL 9.8
- TI-2025-37266 FlagForgeCTF is Missing Authorization in main-v2 CVSS 3.1CRITICAL 9.8
- TI-2025-37320 FlagForgeCTF Unauthenticated Resource Modification/Deletion CVSS 3.1HIGH 8.6
- TI-2026-17569 Flag Forge has ReDoS Vulnerability in User Profile Lookup API CVSS 3.1HIGH 7.5
- TI-2025-37282 FlagForgeCTF Exposes User Emails via Public /api/user/[username] API CVSS 4.0MEDIUM 6.9
Sources
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences