Answer in brief
CVE-2026-106557 records a High severity (CVSS 7.7) vulnerability in Backstage: Improper input validation in TechDocs Markdown extension configuration. The current sources do not mark it as known exploited. The current feed maps backstage/backstage (generic), @backstage/plugin-techdocs-node (generic), @backstage/plugin-techdocs-node (npm). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 7.7. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps backstage/backstage (generic), @backstage/plugin-techdocs-node (generic), @backstage/plugin-techdocs-node (npm). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| backstage/backstagegeneric | <1.50.5 || >=1.51.0-next.0 <1.54.6 | 1.50.5, 1.54.6 |
| @backstage/plugin-techdocs-nodegeneric | <1.14.6 || >=1.15.0 <1.15.4 | 1.14.6, 1.15.4 |
| @backstage/plugin-techdocs-nodenpm | <1.15.4 | 1.15.4 |
Published upstream
Oct 7, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Oct 7, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Oct 7, 2026
Backstage is an open framework for building developer portals. Prior to 1.14.6 and 1.15.4, the @backstage/plugin-techdocs-node package did not sufficiently validate TechDocs Markdown extension configuration. An authenticated user who can register or modify documentation sources may cause a TechDocs build to access resources outside the intended documentation boundary, potentially exposing backend-host data or internal network resources. This issue is fixed in versions 1.14.6 and 1.15.4 when pymdown-extensions 10.21.3 or later is also used, normally through mkdocs-techdocs-core 1.7.0 or later.
Quoted source text, attributed separately from HOL analysis.