What is CVE-2025-59826?

CVE-2025-59826 is a high-severity vulnerability in Flagforge, classified under Missing Authorization. CVSS score: 7.6/10. Published 2025-09-23.

How severe is CVE-2025-59826?

High severity. CVSS v3 base score is 7.6 out of 10.

Is CVE-2025-59826 known to be exploited?

1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Auth bypass in Flagforge

CVE-2025-59826

Flag Forge is a Capture The Flag (CTF) platform. In version 2.1.0, non-admin users can create arbitrary challenges, potentially introducing malicious, incorrect, or misleading content. This issue has been patched in version 2.2.0.

Vulnerability class: Broken Access Control

EPSS: 0.002 (11.8th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.6 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:L.

Affected products

Flagforge — versions 2.1.0
Flagforgectf Flagforge — versions = 2.1.0

Weakness classification (CWE)

CWE-862 — Missing Authorization

Public proof-of-concept exploits

fkie-cad/nvd-json-data-feeds

References

security-advisories@github.com (x_refsource_CONFIRM, Vendor Advisory)

Frequently asked questions

What is CVE-2025-59826?: CVE-2025-59826 is a high-severity vulnerability in Flagforge, classified under Missing Authorization. CVSS score: 7.6/10. Published 2025-09-23.
How severe is CVE-2025-59826?: High severity. CVSS v3 base score is 7.6 out of 10.
Is CVE-2025-59826 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.