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TI-2026-69054 Aliases CVE-2026-106458GHSA-c36c-cf6r-ghgj

Inconsistent repository filtering in Backstage Bitbucket Server events

Priority LOW 28CWE-863Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
None
Attack complexity
Low
Impact type
Security bypass
Confidentiality · integrity · availability
None · High · None
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub. Impact type from CWE-863.

Summary

The @backstage/plugin-catalog-backend-module-bitbucket-server package from 0.4.0 before 0.5.15 filters repositories inconsistently in its event-driven catalog updates. An authenticated Bitbucket Server user with push access to a repository that the configured filters exclude can trigger a repository event (CWE-863). The event path then adds a catalog Location for that repository, even though scheduled discovery excludes it.

Written with Claude Haiku 5.5 from the sources below · 2026-10-29

Description from the CNA

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00268 19th percentileScored 2026-11-07
Fix Fixed backstage (backstage): 1.55.0plugin-catalog-backend-module-bitbucket-server (@backstage): 0.5.15+1 more product

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
backstagebackstage1.38.0 to before 1.55.01.55.0Patch availableCNA
backstageplugin-catalog-backend-module-bitbucket-server0.4.0 to before 0.5.150.5.15Patch availableCNA
—@backstage/plugin-catalog-backend-module-bitbucket-server (npm)0.4.0 to before 0.5.150.5.15Patch availableGHSA-c36c-cf6r-ghgj
  • backstage Vendorbackstage Affected 1.38.0 to before 1.55.0 Fixed in 1.55.0 Patch available CNA
  • plugin-catalog-backend-module-bitbucket-server Vendorbackstage Affected 0.4.0 to before 0.5.15 Fixed in 0.5.15 Patch available CNA
  • @backstage/plugin-catalog-backend-module-bitbucket-server (npm) Vendor— Affected 0.4.0 to before 0.5.15 Fixed in 0.5.15 Patch available GHSA-c36c-cf6r-ghgj

CPE configurations NVD · 2

CPEVersionsRoleVendor
cpe:2.3:a:linuxfoundation:backstage\/plugin-catalog-backend-module-bitbucket-server:*:*:*:*:*:node.js:*:*0.4.0 to before 0.5.15Vulnerablebackstage
cpe:2.3:a:linuxfoundation:backstage:*:*:*:*:*:*:*:*1.38.0 to before 1.55.0Vulnerablebackstage
  • cpe:2.3:a:linuxfoundation:backstage\/plugin-catalog-backend-module-bitbucket-server:*:*:*:*:*:node.js:*:* Versions 0.4.0 to before 0.5.15 Vulnerable ·backstage
  • cpe:2.3:a:linuxfoundation:backstage:*:*:*:*:*:*:*:* Versions 1.38.0 to before 1.55.0 Vulnerable ·backstage

Remediation

Update @backstage/plugin-catalog-backend-module-bitbucket-server to version 0.5.15. The sources list no fixed version for backstage.

Written with Claude Haiku 5.5 from the sources below · 2026-10-29

  • Fix · CNA backstage (backstage) Fixed in 1.55.0
  • Fix · CNA plugin-catalog-backend-module-bitbucket-server (@backstage) Fixed in 0.5.15
  • Fix · GHSA-c36c-cf6r-ghgj @backstage/plugin-catalog-backend-module-bitbucket-server (npm) Fixed in 0.5.15 Advisory →

Timeline

  1. 2026-10-07 Threatist record created from CVE-2026-106458
  2. 2026-10-07 CISA SSVC decision points changed
  3. 2026-10-07 Priority changed: MEDIUM → LOW
  4. 2026-10-07 Alias added: GHSA-c36c-cf6r-ghgj
  5. 2026-10-07 Fix available: npm/@backstage/[email protected] · GHSA-c36c-cf6r-ghgj
  6. 2026-10-07 CVSS score added · GHSA-c36c-cf6r-ghgj
  7. 2026-10-07 Weakness changed · GHSA-c36c-cf6r-ghgj
  8. 2026-10-07 5 new references · GHSA-c36c-cf6r-ghgj

References

Patch 2

Advisory 2

Other 1

  • TI-2023-17988 Insecure sandbox in Backstage Scaffolder plugin CVSS 3.1CRITICAL 9.9
  • TI-2026-69075 Sensitive information exposure in Backstage Scaffolder CVSS 3.1CRITICAL 9.6
  • TI-2026-69061 Path traversal in Backstage Bitbucket pull-request scaffolder actions CVSS 3.1CRITICAL 9.9
  • TI-2026-60083 Backstage: Improper input validation in TechDocs MkDocs configuration CVSS 3.1HIGH 8.8
  • TI-2026-69165 Backstage TechDocs config flaw allows code execution CVSS 3.1HIGH 8.8
  • TI-2026-69083 Code injection via MkDocs theme configuration in Backstage TechDocs CVSS 3.1HIGH 8.8
See all 52 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences