VulnerabilityAnalyzed

CVE-2026-106458

Backstage is an open framework for building developer portals.

MEDIUM 6.5EPSS 0.27%

Does this matter?

Lower severity and a low EPSS score (0.27%). Track it; it rarely justifies an emergency change on its own.

Description

Backstage is an open framework for building developer portals. From 0.4.0 until 0.5.15, the @backstage/plugin-catalog-backend-module-bitbucket-server package is affected by inconsistent repository filtering in bitbucket server catalog event updates. Deployments using event-driven updates in the Bitbucket Server catalog provider may ingest catalog locations from repositories that are excluded by the provider's configured project, repository, or archived-repository filters. An authenticated Bitbucket Server user who can push to a filtered-out repository that remains readable by the configured Backstage integration can trigger a legitimate repository event. The affected event path may then add a Location for that repository even though scheduled discovery excludes it. This issue is fixed in version 0.5.15.

CVSS 3.1: 6.5 MEDIUMCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
EPSS: 0.27% probability · 19th percentile
Public exploits: None in Exploit-DB
CISA KEV: Not listed
Weakness: CWE-863
Affected: linuxfoundation/backstage\/plugin-catalog-backend-module-bitbucket-server · linuxfoundation/backstage
Source: security-advisories@github.com

EPSS trend

EPSS moved from 0.3% on 7 October 2026 to 0.3% on 26 October 2026.

References

https://github.com/backstage/backstage/commit/989db63b6f87c8fc04d440f296ad89e10c79b363Patch
https://github.com/backstage/backstage/releases/tag/v1.55.0Patch, Release Notes
https://github.com/backstage/backstage/security/advisories/GHSA-c36c-cf6r-ghgjMitigation, Vendor Advisory

Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.