CVE-2025-59841 CRITICAL

CVE-2025-59841: FlagForgeCTF's Improper Session Handling Allows Access After Logout

Vendor Flagforgectf
Product flagForge
Weakness CWE-384 · Session fixation
Published September 25, 2025
Last update September 29, 2025
View on NVD All CVEs

CVSS base score

9.8/10
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Confidentiality High
Integrity High

CVSS vector

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

What the vulnerability does

01Description

Flag Forge is a Capture The Flag (CTF) platform. In versions from 2.2.0 to before 2.3.1, the FlagForge web application improperly handles session invalidation. Authenticated users can continue to access protected endpoints, such as /api/profile, even after logging out. CSRF tokens are also still valid post-logout, which can allow unauthorized actions. This issue has been patched in version 2.3.1.

Key dates

02Disclosure timeline

September 25, 2025 CVE published
September 29, 2025 Record updated