Vulnerability · Published Oct 6, 2026 · Assigned by GitHub_M

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

Medium 5.3

In plain English

A medium-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 0.4% (higher than 33% of all known vulnerabilities).

Severity (CVSS 3.1)5.3Medium

Exploit odds (30 days)0.4%top 66.8% 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 1.15.4, 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 (as reported)

Vendor	Product	Versions
backstage	backstage	< 1.54.6
@backstage/plugin-techdocs-node	plugin-techdocs-node	< 1.15.4

Weakness: CWE-59, CWE-61 · Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N

References

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