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Vulnerabilities

Security fix · CVE-2025-59841

Flag Forge is a Capture The Flag (CTF) platform.

Published Sep 25, 2025 · catalog updated Sep 29, 2025 · FlagForgeCTF flagForge

Last checked Oct 25, 2026. A connected source was read within the last 7 days.

Check if you run it

No confirmed exploitation is on record for CVE-2025-59841. EPSS is 0.39%. Act only if a listed version of FlagForgeCTF flagForge is installed.

Gaps on this record

  • No vendor fix or required action is stored. Compare the linked advisory before you change production.

Same product and reporting

Severity
Critical9.8
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.39%
Remediation
Version ranges on file
Affected products
vendor FlagForgeCTF flagForge 2.2.0, < 2.3.1

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.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • vendor FlagForgeCTF flagForge 2.2.0, < 2.3.12.2.0, < 2.3.1

How to fix CVE-2025-59841

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2025-59841. EPSS is 0.39%. Act only if a listed version of FlagForgeCTF flagForge is installed.

Which versions are affected?

Compare what you have installed with FlagForgeCTF flagForge 2.2.0, < 2.3.1 2.2.0, < 2.3.1. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

No weakness class is stored. EPSS 0.39%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

Timeline

Detection, updates, and resolution for this record.

  1. Sep 25, 2025 · EUVD

    Detected

    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.

  2. Sep 29, 2025 · EUVD

    Updated

    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.

Sources

  • CVE.orgVulnerability recordCVE-2025-59841

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2025-59841

    30-day exploitation probability 0.39%

    first.org
  • EUVDVulnerability recordEUVD-2025-31126

    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 token

    euvd.enisa.europa.eu

References

Freshness

Last verified in this catalog Oct 25, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.

  • FIRST EPSSOct 25, 2026
  • CVE.orgOct 23, 2026
  • EUVDOct 23, 2026