Medium severity · published Oct 6, 2026
CVE-2026-106458
Backstage: Inconsistent repository filtering in Bitbucket Server catalog event updates
6.5
CVSS
0.3%
EPSS
No
On KEV
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 vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
None
Integrity
High
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.3% · higher than 19% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
BA
backstage · backstage
>= 1.38.0, < 1.55.0 · source: vendor, NVD
PL
plugin-catalog-backend-module-bitbucket-server · @backstage
>= 0.4.0, < 0.5.15 · source: vendor
BA
Backstage/plugin-catalog-backend-module-bitbucket-server · Linuxfoundation
0.4.0 before 0.5.15 · source: NVD
Affected product
PL
plugin-catalog-backend-module-bitbucket-server
@backstage
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-106458
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-106458
x_refsource_CONFIRM
https://github.com/backstage/backstage/security/advisories/GHSA-c36c-cf6r-ghgj
x_refsource_MISC
https://github.com/backstage/backstage/commit/989db63b6f87c8fc04d440f296ad89e10c79b363
x_refsource_MISC
https://github.com/backstage/backstage/releases/tag/v1.55.0
