EUVD-2026-94371
GHSA-qmw3-745m-w99g
Severity by source
AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Authenticated contributor supplying a docs source gives PR:L with no user interaction; unsanitized mapping reliably yields code execution, so AC:L and full C/I/A impact.
Primary rating from Vendor (GitHub_M).
CVSS VectorVendor: GitHub_M
Lifecycle Timeline
4DescriptionCVE.org
Backstage is an open framework for building developer portals. Prior to 1.14.8, 1.15.6, and 2.0.1, the @backstage/plugin-techdocs-node package improperly validated mapping-style markdown_extensions configuration. An authenticated attacker who can register or influence an SCM-backed documentation source may bypass TechDocs sanitization and cause Python objects to be imported and instantiated in the generator runtime, leading to arbitrary code execution. Earlier fixes in versions 1.14.6 and 1.15.4 did not fully address the supported mapping representation of markdown_extensions. Impact is greatest when documentation generation runs with backend credentials, filesystem access, or internal network access. This issue is fixed in versions 1.14.8, 1.15.6, and 2.0.1.
Articles & Coverage 1
AnalysisAI
Authenticated remote code execution in the @backstage/plugin-techdocs-node package shipped with the Backstage developer portal framework allows a user who can register or influence an SCM-backed documentation source to execute arbitrary code on the TechDocs backend host. The flaw (CWE-502, CVSS 8.8, vector AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H) arises because mapping-style markdown_extensions entries in a committed mkdocs.yml were not sanitized, letting an attacker name Python callables such as subprocess:Popen or os:system that MkDocs then imports and instantiates during documentation generation. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Requires an authenticated attacker (PR:L) who can register or influence an SCM-backed TechDocs documentation source and commit a crafted mkdocs.yml containing a mapping-style markdown_extensions entry that references Python callables (e.g. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | This is a genuine high-priority issue rather than a CVSS-inflated one, but its exploitability is gated by a real precondition. … 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 | Vendor-released patch: upgrade @backstage/plugin-techdocs-node to 1.14.8, 1.15.6, or 2.0.1 depending on your release line, or move to a Backstage release carrying the fix (release tags v1.50.7, v1.54.9 and v1.55.2 are referenced in the advisory). … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, inventory all Backstage deployments and identify those using @backstage/plugin-techdocs-node with server-side TechDocs generation; restrict or suspend account registration and SCM-backed documentation source influence for untrusted users; disable server-side TechDocs generation for attacker-controlled or external sources, or switch to trusted CI/build-time generation only; search committed mkdocs.yml files for markdown_extensions mapping entries naming Python callables such as subprocess:Popen or os:system and remove or quarantine suspicious entries. …
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External POC / Exploit Code
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