CVE-2026-29186 @backstage/plugin-techdocs-node: TechDocs Mkdocs Configuration Key Enables Arbitrary Code Execution

Backstage is an open framework for building developer portals. Prior to version 1.14.3, this is a configuration bypass vulnerability that enables arbitrary code execution. The @backstage/plugin-techdocs-node package uses an allowlist to filter dangerous MkDocs configuration keys during the...

CVE-2026-29186: Unrestricted Upload of File with Dangerous Type

Backstage is an open framework for building developer portals. Prior to version 1.14.3, this is a configuration bypass vulnerability that enables arbitrary code execution. The @backstage/plugin-techdocs-node package uses an allowlist to filter dangerous MkDocs configuration keys during the...

Permissive List of Allowed Inputs

Overview @backstage/plugin-techdocs-node is a Common node.js functionalities for TechDocs, to be shared between techdocs-backend plugin and techdocs-cli Affected versions of this package are vulnerable to Permissive List of Allowed Inputs via the processing of the mkdocs.yml configuration file...

@backstage/plugin-search-backend-module-techdocs (>=0.4.11-next.0, <=0.4.11-next.1), @backstage/plugin-techdocs-backend (>=0.0.0-nightly-20260123025240, <=2.1.5-next.2) +1 more potentially affected by CVE-2026-29186 via @backstage/plugin-techdocs-node (>=1.13.11-next.0, <=1.14.2-next.1)

@backstage/plugin-techdocs-node NPM version =1.13.11-next.0, =0.4.11-next.0, =0.0.0-nightly-20260123025240, =0.0.0-nightly-20260123025240, =1.10.5-next.1 Source cves: CVE-2026-29186 Source advisory: SNYK:JS-BACKSTAGEPLUGINTECHDOCSNODE-15426449...

GHSA-928R-FM4V-MVRW TechDocs Mkdocs Configuration Key Enables Arbitrary Code Execution

Impact This is a configuration bypass vulnerability that enables arbitrary code execution. The @backstage/plugin-techdocs-node package uses an allowlist to filter dangerous MkDocs configuration keys during the documentation build process. A gap in this allowlist allows attackers to craft an...

@backstage/plugin-search-backend-module-techdocs (>=0.4.2-next.0, <=0.4.11-next.1), @backstage/plugin-techdocs-backend (>=0.0.0-nightly-2021111822616, <=2.1.5-next.2) +2 more potentially affected by CVE-2026-29186 via @backstage/plugin-techdocs-node (>=1.0.0, <=1.14.2-next.1)

@backstage/plugin-techdocs-node NPM version =1.0.0, =0.4.2-next.0, =0.0.0-nightly-2021111822616, =0.11.13, =0.0.0-nightly-2021111822616, =1.10.5-next.1 Source cves: CVE-2026-29186 Source advisory: OSV:GHSA-928R-FM4V-MVRW...

TechDocs Mkdocs Configuration Key Enables Arbitrary Code Execution

Impact This is a configuration bypass vulnerability that enables arbitrary code execution. The @backstage/plugin-techdocs-node package uses an allowlist to filter dangerous MkDocs configuration keys during the documentation build process. A gap in this allowlist allows attackers to craft an...

PT-2026-23441

Name of the Vulnerable Software and Affected Versions Backstage versions prior to 1.14.3 Description Backstage, an open framework for building developer portals, contains a configuration bypass that can lead to arbitrary code execution. The @backstage/plugin-techdocs-node package uses an allowlis...

Remote Code Execution (RCE)

@backstage/plugin-techdocs-node is vulnerable to Remote Code Execution RCE. The vulnerability is due to improper sanitization of user-controlled mkdocs.yml configuration specifically MkDocs hooks when TechDocs is configured with runIn: local, which allows an attacker to execute arbitrary Python...

@backstage/plugin-techdocs-node vulnerable to arbitrary code execution via MkDocs hooks

Impact When TechDocs is configured with runIn: local, a malicious actor who can submit or modify a repository's mkdocs.yml file can execute arbitrary Python code on the TechDocs build server via MkDocs hooks configuration. Patches Upgrade to @backstage/plugin-techdocs-node version 1.13.11, 1.14.1...

@backstage/plugin-techdocs-backend (>=0.0.0-nightly-20260123025240, <=0.0.0-nightly-20260126030220), @techdocs/cli (>=0.0.0-nightly-20260123025240, <=0.0.0-nightly-20260126030220) potentially affected by CVE-2026-25153 via @backstage/plugin-techdocs-node (1.14.0)

@backstage/plugin-techdocs-node NPM version 1.14.0 is affected by a known vulnerability. The following packages have a transitive dependency on @backstage/plugin-techdocs-node and may be impacted: - @backstage/plugin-techdocs-backend =0.0.0-nightly-20260123025240, =0.0.0-nightly-20260123025240,...

GHSA-6JR7-99PF-8VGF @backstage/plugin-techdocs-node vulnerable to arbitrary code execution via MkDocs hooks

Impact When TechDocs is configured with runIn: local, a malicious actor who can submit or modify a repository's mkdocs.yml file can execute arbitrary Python code on the TechDocs build server via MkDocs hooks configuration. Patches Upgrade to @backstage/plugin-techdocs-node version 1.13.11, 1.14.1...

@backstage/plugin-search-backend-module-techdocs (>=0.4.2-next.0, <=0.4.9-next.1), @backstage/plugin-techdocs-backend (>=0.0.0-nightly-2021111822616, <=2.1.4-next.0) +2 more potentially affected by CVE-2026-25152 via @backstage/plugin-techdocs-node (>=1.0.0, <=1.13.10-next.1)

@backstage/plugin-techdocs-node NPM version =1.0.0, =0.4.2-next.0, =0.0.0-nightly-2021111822616, =0.11.13, =0.0.0-nightly-2021111822616, =1.10.4-next.0 Source cves: CVE-2026-25152 Source advisory: OSV:GHSA-W669-JJ7H-88M9...

GHSA-W669-JJ7H-88M9 @backstage/plugin-techdocs-node vulnerable to possible Path Traversal in TechDocs Local Generator

Impact A path traversal vulnerability in the TechDocs local generator allows attackers to read arbitrary files from the host filesystem when Backstage is configured with techdocs.generator.runIn: local. When processing documentation from untrusted sources, symlinks within the docs directory are...

@backstage/plugin-techdocs-backend (>=0.0.0-nightly-20260123025240, <=0.0.0-nightly-20260126030220), @techdocs/cli (>=0.0.0-nightly-20260123025240, <=0.0.0-nightly-20260126030220) potentially affected by CVE-2026-25152 via @backstage/plugin-techdocs-node (1.14.0)

@backstage/plugin-techdocs-node NPM version 1.14.0 is affected by a known vulnerability. The following packages have a transitive dependency on @backstage/plugin-techdocs-node and may be impacted: - @backstage/plugin-techdocs-backend =0.0.0-nightly-20260123025240, =0.0.0-nightly-20260123025240,...

@backstage/plugin-techdocs-node vulnerable to possible Path Traversal in TechDocs Local Generator

Impact A path traversal vulnerability in the TechDocs local generator allows attackers to read arbitrary files from the host filesystem when Backstage is configured with techdocs.generator.runIn: local. When processing documentation from untrusted sources, symlinks within the docs directory are...

CVE-2026-25152

Backstage is an open framework for building developer portals, and @backstage/plugin-techdocs-node provides common node.js functionalities for TechDocs. In versions of @backstage/plugin-techdocs-node prior to 1.13.11 and 1.14.1, a path traversal vulnerability in the TechDocs local generator allow...

CVE-2026-25153

Backstage is an open framework for building developer portals, and @backstage/plugin-techdocs-node provides common node.js functionalities for TechDocs. In versions of @backstage/plugin-techdocs-node prior to 1.13.11 and 1.14.1, when TechDocs is configured with runIn: local, a malicious actor who...

CVE-2026-25152

Backstage is an open framework for building developer portals, and @backstage/plugin-techdocs-node provides common node.js functionalities for TechDocs. In versions of @backstage/plugin-techdocs-node prior to 1.13.11 and 1.14.1, a path traversal vulnerability in the TechDocs local generator allow...

CVE-2026-25152

The CVE-2026-25152 entry concerns the Backstage @backstage/plugin-techdocs-node, where versions before 1.13.11 and 1.14.1 allow path traversal via the TechDocs local generator when techdocs.generator.runIn is set to local. This permits reading arbitrary host files as MkDocs follows symlinks in do...