GHSA-q38j-6vcm-2f5m

Suggest an improvement
Source
https://github.com/advisories/GHSA-q38j-6vcm-2f5m
Import Source
https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/10/GHSA-q38j-6vcm-2f5m/GHSA-q38j-6vcm-2f5m.json
JSON Data
https://api.osv.dev/v1/vulns/GHSA-q38j-6vcm-2f5m
Aliases
Published
2026-10-07T20:25:19Z
Modified
2026-10-07T20:30:07Z
Severity
  • 7.7 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N CVSS Calculator
Summary
Backstage: Improper validation of MkDocs plugin configuration in TechDocs
Details

Impact

An authenticated attacker with control over a TechDocs source repository could cause a documentation build to retrieve and publish data from network locations reachable by the build environment. Exposure depends on deployment topology, build mode, and target endpoint protections. Modern cloud metadata services that require tokens or special headers are not directly accessible through the affected behavior.

Patches

Upgrade @backstage/plugin-techdocs-node to a patched version for the applicable release line:

The update removes MkDocs plugins outside the built-in allowlist. To retain additional plugins, review them and configure techdocs.generator.mkdocs.dangerouslyAllowAdditionalPlugins, or supply dangerouslyAllowAdditionalPlugins when creating the generator directly. Plugins supplied through defaultPlugins remain permitted.

Workarounds

  • Restrict control of TechDocs source repositories and catalog registration to trusted maintainers.
  • Run documentation builders with outbound access to private and link-local networks denied.
  • Require token- or header-protected cloud instance metadata services.
Database specific 
{
    "cwe_ids": [
        "CWE-918"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-10-07T20:25:19Z",
    "nvd_published_at": "2026-10-06T21:17:15Z",
    "severity": "HIGH"
}
References

Affected packages

npm / @backstage/plugin-techdocs-node

Package

Name
@backstage/plugin-techdocs-node
View open source insights on deps.dev
Purl
pkg:npm/%40backstage/plugin-techdocs-node

Affected ranges

Type
SEMVER
Events
Introduced
0.11.12
Fixed
1.14.7

Database specific

source 
"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/10/GHSA-q38j-6vcm-2f5m/GHSA-q38j-6vcm-2f5m.json"

npm / @backstage/plugin-techdocs-node

Package

Name
@backstage/plugin-techdocs-node
View open source insights on deps.dev
Purl
pkg:npm/%40backstage/plugin-techdocs-node

Affected ranges

Type
SEMVER
Events
Introduced
1.15.0
Fixed
1.15.5

Database specific

source 
"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/10/GHSA-q38j-6vcm-2f5m/GHSA-q38j-6vcm-2f5m.json"