Vulnerability · Published Oct 6, 2026 · Assigned by GitHub_M

CVE-2026-106496Backstage: Inconsistent enforcement of allowed location types during catalog processing

Low 3.1

In plain English

A low-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 0.2% (higher than 16% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)3.1Low

Exploit odds (30 days)0.2%top 84.3% 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 3.9.1, the @backstage/plugin-catalog-backend package is affected by inconsistent enforcement of allowed location types during catalog processing. Under certain configurations, the catalog backend could process location types that were not intended to be allowed, potentially leading to unintended file access on the backend host. This issue is fixed in version 3.9.1.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
npm	@backstage/plugin-catalog-backend	3.9.1	GHSA-pcmq-25r3-5w9v

Affected products (as reported)

Vendor	Product	Versions
backstage	backstage	< 1.54.6
@backstage	plugin-catalog-backend	< 3.9.1

Weakness: CWE-22, CWE-863 · Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:L/A:N

References

https://github.com/backstage/backstage/security/advisories/GHSA-pcmq-25r3-5w9v x_refsource_CONFIRM
https://github.com/backstage/backstage/commit/23774b61560d851bc69cd6a77d12561b24d11afd x_refsource_MISC
https://github.com/backstage/backstage/releases/tag/v1.54.6 x_refsource_MISC