CVE-2025-59833 - CVE House
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Status published High CVE-2025-59833

FlagForgeCTF Hint Exposure via API

Vulnerability Description

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.

Impact Analysis

Refer to official advisory for detailed impact metrics.

Remediation

Ensure systems are updated to the latest vendor-supplied patch levels.

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Credits & Attribution

No credits recorded in the NVD database.

References

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CVE-2025-59843
FlagForgeCTF Exposes User Emails via Public /api/user/[username] API
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CVE-2025-59841
FlagForgeCTF's Improper Session Handling Allows Access After Logout
Critical 9.8
CVE-2025-59827
FlagForgeCTF is Missing Authorization in main-v2
High 8.2

Affected Vendor

FlagForgeCTF

View all reports →

Affected Software

flagForge
Vulnerable Versions:
>= 2.1.0, < 2.3.0

Timeline

Official Publish: September 24th, 2025
Last Modified: September 24th, 2025
Added to House: July 22nd, 2026

CVSS Vectors

V3: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Weaknesses (CWE)

CWE-200

MITRE ATT&CK TTPs

T1213 Data from Information Repositories
Collection
T1005 Data from Local System
Collection
T1552 Unsecured Credentials
Credential Access
T1041 Exfiltration Over C2 Channel
Exfiltration