CVE-2025-59841 - CVE House
Back to Database
Status published Critical CVE-2025-59841

FlagForgeCTF's Improper Session Handling Allows Access After Logout

Vulnerability Description

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.

Impact Analysis

Refer to official advisory for detailed impact metrics.

Remediation

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

THREAT MONITOR

Am I Vulnerable?

Launch our assessment wizard to check if your infrastructure is exposed to • CVE-2025-59841

Credits & Attribution

No credits recorded in the NVD database.

References

More from FlagForgeCTF

View All →
CVE-2025-61777
FlagForge Allows Unauthenticated Badge Template API Access
Critical 9.4
CVE-2025-59932
FlagForgeCTF Unauthenticated Resource Modification/Deletion
High 8.6
CVE-2025-59843
FlagForgeCTF Exposes User Emails via Public /api/user/[username] API
Medium 6.9
CVE-2025-59833
FlagForgeCTF Hint Exposure via API
High 7.5
CVE-2025-59827
FlagForgeCTF is Missing Authorization in main-v2
High 8.2

Affected Vendor

FlagForgeCTF

View all reports →

Affected Software

flagForge
Vulnerable Versions:
>= 2.2.0, < 2.3.1

Timeline

Official Publish: September 25th, 2025
Last Modified: September 29th, 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:H/A:H

Weaknesses (CWE)

CWE-384 CWE-613

MITRE ATT&CK TTPs

T1189 Drive-by Compromise
Initial Access
T1078 Valid Accounts
Persistence
T1539 Steal Web Session Cookie
Credential Access
T1550 Use Alternate Authentication Material
Defense Evasion
T1021 Remote Services
Lateral Movement
T1562 Impair Defenses
Defense Evasion