CVE-2025-59826: Flag Forge is a Capture The Flag (CTF) platform

Routine

HIGH 7.6DOWNGRADE

CVE-2025-59826 is a high-severity flaw (CVSS 7.6) affecting flagforge. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

High severity

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	7.6 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.2% (top 85%)
CISA exploited list	No
Weakness	CWE-862
Published	2025-09-23
Last modified	2026-10-11

Publisher (CNA): GitHub, Inc. · Vendor: flagforge

Last updated 2026-10-11 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2025-09-23 21:15 UTCPublished CVE record published
2026-10-11 20:10 UTCUpdated Record last modified

flagforge flagforge DOWNGRADE

Affected: 2.1.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 2.1.0

1. Check installed version

apt-cache policy flagforge || rpm -q flagforge || flagforge --version

2. No fixed release: DOWNGRADE to a release before 2.1.0 (Debian / Ubuntu)

apt-cache madison flagforge sudo apt install flagforge=<VERSION_BEFORE_2.1.0> sudo apt-mark hold flagforge

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list flagforge sudo dnf downgrade flagforge-<VERSION_BEFORE_2.1.0> sudo dnf versionlock add flagforge

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2025-59826?

flagforge: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2025-59826 being exploited?

CVE-2025-59826 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2025-59826 affect?

CVE-2025-59826 affects flagforge. Severity is high (CVSS 7.6). 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.

How urgent is CVE-2025-59826?

Priority 30/100. High severity

Related CVEs

CVE-2025-59841 CRITICAL 9.8 UPGRADE Flag Forge is a Capture The Flag (CTF) platform
CVE-2025-61777 CRITICAL 9.4 UPGRADE Flag Forge is a Capture The Flag (CTF) platform
CVE-2025-59932 HIGH 8.6 UPGRADE Flag Forge is a Capture The Flag (CTF) platform
CVE-2025-59843 MEDIUM 5.3 UPGRADE Flag Forge is a Capture The Flag (CTF) platform
CVE-2026-21868 HIGH 7.5 UPGRADE Flag Forge is a Capture The Flag (CTF) platform

References

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