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Vulnerability · Published Oct 7, 2026 · Assigned by GitHub_M

CVE-2026-106556Backstage: Configuration bypass in TechDocs mkdocs.yml sanitization

High 7.7

In plain English

A high-severity OS command injection in backstage from backstage. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 17% of all known vulnerabilities).

Severity (CVSS 3.1)7.7High
Exploit odds (30 days)0.3%top 82.6% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official description

Backstage is an open framework for building developer portals. Prior to 1.14.6, the @backstage/plugin-techdocs-node package is affected by configuration bypass in techdocs mkdocs.yml sanitization. Insufficient validation of MkDocs configuration during TechDocs generation could allow an authenticated user who can register or modify documentation sources to execute arbitrary commands in the build environment. Impact is limited to resources accessible to the TechDocs backend or build container. This issue is fixed in versions 1.14.6 and 1.15.4.

Affected products (as reported)

VendorProductVersions
backstage backstage < 1.50.5>= 1.51.0-next.0, < 1.54.6
@backstage plugin-techdocs-node < 1.14.6>= 1.15.0, < 1.15.4

Weakness: CWE-78, CWE-184 · Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:L/A:L

References