Path Traversal in Decaporg Decap-Cms
CVE-2026-92812
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.
Vulnerability class: Path Traversal (Directory Traversal)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.004 (38.3th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 38th percentile — 38.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: +0.000
Affected products
- Decaporg Decap-Cms
- Decaporg Decap-Server — versions 11f35405cd1a1d1216e97b890173f46436752019
Weakness classification (CWE)
References
- github.com/geo-chen/oss/blob/main/decap-cms.md (technical-description, exploit)
- github.com/decaporg/decap-cms/blob/11f35405cd1a1d1216e97b890173f46436752019/pac… (technical-description)
- github.com/decaporg/decap-cms (product)
- www.vulncheck.com/advisories/decap-server-path-traversal-via-sibling-directory-… (third-party-advisory)
- github.com/decaporg/decap-cms/security/advisories/GHSA-5rrq-v82w-qpfr (vendor-advisory)
- github.com/decaporg/decap-cms/releases (release-notes, patch)
- www.vulncheck.com/advisories/decap-cms-path-traversal-via-sibling-directory-pre… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-92812?
- CVE-2026-92812 is a critical-severity vulnerability in Decaporg Decap-Cms, classified under Path Traversal. CVSS score: 9.8/10. Published 2026-09-16.
- How severe is CVE-2026-92812?
- Critical severity. CVSS v3 base score is 9.8 out of 10.