What’s Vulnerable › Vulnerabilities

CVE-2026-106507: Backstage: TechDocs arbitrary file read via mkdocs snippets

• Severity: medium (CVSS 6.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-10-06 · updated 2026-10-09
• Weakness: CWE-59

Description

Backstage is an open framework for building developer portals. Prior to 1.15.4, the @backstage/plugin-techdocs-node package is affected by techdocs arbitrary file read via mkdocs snippets. Unsafe path resolution in TechDocs source tree handling allows an authenticated user who can register documentation sources to include content from outside the intended documentation boundary. Depending on deployment, this may expose files readable by the build process. This issue is fixed in version 1.15.4.

Affected products

• backstage: before 1.54.6 — fixed in 1.54.6
• Linuxfoundation Backstage Plugin-Techdocs-Node: before 1.15.4 — fixed in 1.15.4

How to fix

Upgrade to a fixed version: backstage 1.54.6; Linuxfoundation Backstage Plugin-Techdocs-Node 1.15.4. Check the vendor advisory for mitigations.

References

• https://github.com/backstage/backstage/commit/911ca36f10e654c5517da029129230fc05a4f580
• https://github.com/backstage/backstage/releases/tag/v1.54.6
• https://github.com/backstage/backstage/security/advisories/GHSA-vmqh-7cj9-mvcj

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