Vulnerability · Published Sep 16, 2026 · Assigned by VulnCheck
CVE-2026-92812Decap CMS < 3.11.0 Path Traversal via Sibling Directory Prefix Matching
Critical 9.8
In plain English
A critical-severity path traversal in decap-cms from decaporg. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 39% of all known vulnerabilities).
Severity (CVSS 3.1)9.8Critical
Exploit odds (30 days)0.4%top 61.5% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known
Official description
Decap CMS before 3.11.0 contains a path traversal vulnerability in the local proxy containment guard that uses plain string prefix comparison without path separator validation. Attackers can access sibling directories whose names begin with the repository directory name to read, write, or delete files outside the intended repository root.
Affected products (as reported)
Weakness: CWE-22 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
References
- GitHub Security Advisory (GHSA-5rrq-v82w-qpfr) vendor-advisory
- Researcher Disclosure exploit, technical-description
- Fixed Release Tag release-notes, patch
- VulnCheck Advisory: decap-server Path Traversal via Sibling Directory Prefix Matching third-party-advisory