CVE-2026-106558
highpriority · track · 0EPSS 0.005 · 40 %ileUSEPSS · scored 2026-10-27
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.
cvss
Technical severity, 0–10. One row per scoring source.
base score 0–10 · higher = more severe · hover a vector to decode
ssvc
A stakeholder decision — act, attend, or track — from exploitation and impact.
weaknesses
The CWE weakness classes this flaw belongs to.
affected products (9)
Products and version ranges known to be affected.
- linuxfoundation backstage plugin-techdocs-node< 1.14.8nvdUScpe:2.3:a:linuxfoundation:backstage_plugin-techdocs-node:*:*:*:*:*:*:*:*
- linuxfoundation backstage plugin-techdocs-node1.15.0 → 1.15.6nvdUScpe:2.3:a:linuxfoundation:backstage_plugin-techdocs-node:*:*:*:*:*:*:*:*
- linuxfoundation backstage plugin-techdocs-node2.0.0 → 2.0.1nvdUScpe:2.3:a:linuxfoundation:backstage_plugin-techdocs-node:*:*:*:*:*:*:*:*
advisories (1)
Vendor and ecosystem advisories describing this.
- GHSA-qmw3-745m-w99gBackstage: Improper validation of TechDocs MkDocs configuration2026-10-07ghsa · osvUS
### Impact An attacker who can provide configuration to a TechDocs build may execute code in the generator runtime. Impact is greatest when documentation generation runs with backend credentials or host access. ### Patches Patched in `@backstage/plugin-techdocs-node` version `1.15.4`. ### Workarounds Use external TechDocs generation in an isolated environment without sensitive credentials or host access. Restrict and review changes to documentation configuration before generation.
sources
Which sources assert this record, and when.
references (7) nvd
External citations — patches, advisories, analysis.
- https://github.com/backstage/backstage/commit/32723a0fe4e12ed80535fc65d5331765c55aa91bPatch
- https://github.com/backstage/backstage/commit/944edb51c8524d3664b18f2d57ba101b1c93b709Patch
- https://github.com/backstage/backstage/commit/f18e9abcc6051491862b15e4fc60e69f8d52310cPatch
- https://github.com/backstage/backstage/releases/tag/v1.50.7PatchRelease Notes
- https://github.com/backstage/backstage/releases/tag/v1.54.9PatchRelease Notes
- https://github.com/backstage/backstage/releases/tag/v1.55.2PatchRelease Notes
- https://github.com/backstage/backstage/security/advisories/GHSA-qmw3-745m-w99gMitigationVendor Advisory
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