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Vulnerability · Published Oct 6, 2026 · Assigned by GitHub_M

CVE-2026-106505Backstage: Bypass of MkDocs configuration sanitizer in TechDocs backend

High 7.7

In plain English

A high-severity security flaw 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 24% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)7.7High
Exploit odds (30 days)0.3%top 75.8% 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 and 1.15.4, the @backstage/plugin-techdocs-node package is affected by bypass of mkdocs configuration sanitizer in techdocs backend. Users with the ability to commit changes to a repository that uses TechDocs can circumvent the MkDocs configuration file sanitizer introduced in response to CVE-2026-25153 and execute arbitrary code on the TechDocs backend host during documentation generation. This issue is fixed in versions 1.14.6 and 1.15.4.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
npm@backstage/plugin-techdocs-node1.15.4GHSA-p75x-jh7p-ppcx

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-426, CWE-436 · Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:L/A:L

References