EUVD-2026-81070
GHSA-fjm6-6gxh-mvf2
Severity by source
CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:P/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Local proxy has no auth (PR:N) but needs victim interaction (UI:R) and a pre-existing matching sibling directory (AC:H); enables read/write/delete of files (C:H/I:H) with no availability impact (A:N).
Primary rating from Vendor (VulnCheck).
CVSS VectorVendor: VulnCheck
Lifecycle Timeline
5DescriptionCVE.org
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.
AnalysisAI
Path traversal in decap-server's local proxy containment guard allows an unauthenticated attacker to read, write, or delete files outside the intended repository root whenever a sibling directory's name begins with the repository directory's name. Affected is the decap-server package shipped in the decaporg/decap-cms monorepo, confirmed at commit 11f35405cd1a1d1216e97b890173f46436752019, with the CPE wildcard suggesting all tracked versions of decap-server are in scope. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Requires the decap-server local proxy to be running (Decap CMS local/proxy backend, typically bound to localhost) and a filesystem layout where a sibling directory adjacent to the repository root has a name beginning with the repository directory's name (e.g., repo 'site' and target 'site-private'); the containment guard uses plain string prefix matching without a path-separator check, so such sibling paths pass validation. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | Signals are mixed and point to a real but tightly-scoped issue rather than a mass-exploitation priority. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | No vendor-released patched version was identified in the provided intelligence; the references point to the affected source file and the upstream repository rather than to a fix commit or tagged release, so consumers should track https://github.com/decaporg/decap-cms and the VulnCheck advisory at https://www.vulncheck.com/advisories/decap-server-path-traversal-via-sibling-directory-prefix-matching for the upstream correction, and in the meantime can apply the code-level fix of adding a path-separator boundary check after the prefix comparison in packages/decap-server/src/middlewares/joi/customValidators.ts. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, inventory all deployments of decap-server from the decaporg/decap-cms monorepo (all tracked versions, confirmed at commit 11f35405cd1a1d1216e97b890173f46436752019) and disable the local proxy backend where it is not essential; where it must remain, restrict it to trusted local use and block untrusted browser or cross-origin requests. …
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Same weakness CWE-22 – Path Traversal
View allSame technique Path Traversal
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External POC / Exploit Code
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