Vulnerability · Published Oct 7, 2026 · Assigned by GitHub_M

CVE-2026-106560Backstage: Improper repository path validation in a Scaffolder backend module

High 7.1

In plain English

A high-severity path traversal 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)7.1High

Exploit odds (30 days)0.3%top 75.5% 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. Prior to 0.3.25, the @backstage/plugin-scaffolder-backend-module-confluence-to-markdown package is affected by improper repository path validation in a scaffolder backend module. An authenticated user who can execute an affected template and control its repository file location may cause generated content to be written outside the task workspace, within locations writable by the Backstage backend process. This issue is fixed in version 0.3.25.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
npm	@backstage/plugin-scaffolder-backend-module-confluence-to-markdown	0.3.25	GHSA-2cmg-v53w-8xfp

Affected products (as reported)

Vendor	Product	Versions
backstage	backstage	< 1.54.6
@backstage	plugin-scaffolder-backend-module-confluence-to-markdown	< 0.3.25

Weakness: CWE-22 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:L

References

https://github.com/backstage/backstage/security/advisories/GHSA-2cmg-v53w-8xfp x_refsource_CONFIRM
https://github.com/backstage/backstage/commit/5f0000c1d0af05571e357926b3fa33a453337ff0 x_refsource_MISC
https://github.com/backstage/backstage/releases/tag/v1.54.6 x_refsource_MISC