CVE-2026-92812

Description

decap-server 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.

References

• https://github.com/decaporg/decap-cms
• https://github.com/decaporg/decap-cms/blob/11f35405cd1a1d1216e97b890173f46436752019/packages/decap-server/src/middlewares/joi/customValidators.ts#L11-L16
• https://github.com/geo-chen/oss/blob/main/decap-cms.md
• https://www.vulncheck.com/advisories/decap-server-path-traversal-via-sibling-directory-prefix-matching