FlagForgeCTF Vulnerable to Unauthorized Problem Creation

published 2025-09-23 13 mo ago modified 2026-10-11 28 d ago also EUVD-2025-30932

cvss: 7.6; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.2%; EPSS 0.2% chance of exploitation in 30 days, percentile 14%
public exploits: 0; none known

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.

CISA SSVC

Exploitation: none
Automatable: no
Technical impact: partial
Assessed: 13 mo ago (2025-09-24)

Exploit prediction

0.24% chance of exploitation in the next 30 days, higher than 14% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
CNA	3.1	7.6	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:L

Affected products

FlagForgeCTF flagForge

Classification

Weakness

CWE-862 Missing Authorization

References

github.com /FlagForgeCTF/flagForge/security/advisories/GHSA-q7pg-qchv-3pc5
vendor-advisory

Sources

CVE List CVE-2025-59826
NVD CVE-2025-59826

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary