Log in Start free

Vulnerability · Published Oct 6, 2026 · Assigned by GitHub_M

CVE-2026-106455Backstage: Improper validation of MkDocs plugin configuration in TechDocs

High 7.7

In plain English

A high-severity server-side request forgery 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 0.4% (higher than 36% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)7.7High
Exploit odds (30 days)0.4%top 63.5% 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. From 0.11.12 until 1.14.7 and 1.15.5, the @backstage/plugin-techdocs-node package is affected by improper validation of mkdocs plugin configuration in techdocs. 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. This issue is fixed in @backstage/plugin-techdocs-node versions 1.14.7 and 1.15.5.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
npm@backstage/plugin-techdocs-node1.14.7GHSA-q38j-6vcm-2f5m
npm@backstage/plugin-techdocs-node1.15.5GHSA-q38j-6vcm-2f5m

Affected products (as reported)

VendorProductVersions
backstage backstage >= 0.71.1, < 1.50.6>= 1.51.0-next.0, < 1.54.8
@backstage plugin-techdocs-node >= 0.11.12, < 1.14.7>= 1.15.0, < 1.15.5

Weakness: CWE-918 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N

References