CVE-2025-59841 | Flag Forge is a Capture The Flag (CTF) platform. In versions… | CVSS 9.8 CRITICAL

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.

Metadata

CVE ID: CVE-2025-59841
State: PUBLISHED
Assigner: GitHub_M
Reserved: 2025-09-22 14:34 UTC
Published: 2025-09-25 15:15 UTC
Last updated: 2025-09-29 15:48 UTC
Primary CWE: CWE-384
CWE-384: Session Fixation
Vendor / Product: FlagForgeCTF / flagForge
Sources: cve.org · NVD

Severity & Metrics

9.8 CRITICAL CVSS 3.1

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

SSVC — CISA Coordinator

Exploitation: none
Automatable: yes
Tech. Impact: total

Affected products (1)

Vendor	Product	Platform	Versions
FlagForgeCTF	flagForge	—	>= 2.2.0, < 2.3.1

Weakness (CWE)

CWE	Source	Description
CWE-384	cna	CWE-384: Session Fixation
CWE-613	cna	CWE-613: Insufficient Session Expiration

CVSS scores (1)

Score	Severity	Version	Source	Vector
9.8	CRITICAL	3.1	cna	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

References (2)

https://github.com/FlagForgeCTF/flagForge/security/advisories/GHSA-h6pr-4cwv-6cjg https://github.com/FlagForgeCTF/flagForge/security/advisories/GHSA-h6pr-4cwv-6cjg
https://github.com/FlagForgeCTF/flagForge/commit/304b6c82a4f76871b336404b91e5cdd8a7d7d5bd https://github.com/FlagForgeCTF/flagForge/commit/304b6c82a4f76871b336404b91e5cdd8a7d7d5bd