Session Management Flaw in Flag Forge CTF Platform Affects User Security
CVE-2025-59841

9.8CRITICAL

Key Information:

Vendor

Flagforgectf

Status
Flagforge
Vendor
CVE Published:
25 September 2025

What is CVE-2025-59841?

The Flag Forge CTF platform has a vulnerability affecting versions from 2.2.0 to just before 2.3.1. This flaw allows authenticated users to access protected endpoints even after they have logged out, due to improper session invalidation. Additionally, CSRF tokens remain valid post-logout, which can facilitate unauthorized actions against user accounts. Users are strongly advised to upgrade to version 2.3.1 or later, where this issue has been addressed, to safeguard their sessions and data integrity.

Affected Version(s)

flagForge >= 2.2.0, < 2.3.1

References

https://github.com/FlagForgeCTF/flagForge/security/adviso...
x_refsource_CONFIRM
https://github.com/FlagForgeCTF/flagForge/commit/304b6c82...
x_refsource_MISC

CVSS V3.1

Score:
9.8
Severity:
CRITICAL
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

JSON
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CVE-2025-59841 : Session Management Flaw in Flag Forge CTF Platform Affects User Security