---
id: CVE-2026-92812
title: >-
  decap-server contains a path traversal vulnerability in the local proxy
  containment guard that uses plain string prefix comparison without path
  separator validation
summary: >-
  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 rep…
severity: medium
cvss: 6.8
cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N'
cwe:
  - CWE-22
vendor: decaporg
product: decap-server
affected:
  - decap-server 11f35405cd1a1d1216e97b890173f46436752019
published: '2026-09-16'
updated: '2026-09-22'
sourceUpdated: '2026-09-22T20:53:07.383'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-92812'
references:
  - url: 'https://github.com/decaporg/decap-cms'
    label: disclosure@vulncheck.com
  - url: >-
      https://github.com/decaporg/decap-cms/blob/11f35405cd1a1d1216e97b890173f46436752019/packages/decap-server/src/middlewares/joi/customValidators.ts#L11-L16
    label: disclosure@vulncheck.com
  - url: 'https://github.com/geo-chen/oss/blob/main/decap-cms.md'
    label: disclosure@vulncheck.com
  - url: >-
      https://www.vulncheck.com/advisories/decap-server-path-traversal-via-sibling-directory-prefix-matching
    label: disclosure@vulncheck.com
  - url: >-
      https://github.com/decaporg/decap-cms/security/advisories/GHSA-5rrq-v82w-qpfr
    label: GitHub Security Advisory (GHSA-5rrq-v82w-qpfr)
  - url: >-
      https://github.com/decaporg/decap-cms/releases?page=2#release-decap-cms@3.11.0
    label: Fixed Release Tag
  - url: >-
      https://www.vulncheck.com/advisories/decap-cms-path-traversal-via-sibling-directory-prefix-matching
    label: >-
      VulnCheck Advisory: decap-server Path Traversal via Sibling Directory
      Prefix Matching
tags:
  - nvd
  - cve.org
  - exploit-available
  - score-dispute
epss: 0.00441
epssPercentile: 0.38136
exploitAvailable: true
ssvc:
  exploitation: poc
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-09-19T01:53:24.560519Z'
ingestedAt: '2026-09-16T21:05:36.881Z'
scores:
  nvd: 6.8
  cna: 9.8
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.