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TI-2026-71272 Aliases CVE-2026-106495GHSA-3xr5-8w6c-p5gw

Improper access control in Backstage backend action invocation

Priority LOW 20CWE-284Published · Updated

Key facts

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

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub. Impact type from CWE-284.

Summary

Backstage's @backstage/backend-defaults package, before 0.17.8, has improper access control in backend action invocation (CWE-284). An authenticated user can invoke actions that an operator excluded through action configuration. Existing action permissions and downstream authorization remain enforced.

Written with Claude Haiku 5.5 from the sources below · 2026-11-06

Description from the CNA

Backstage is an open framework for building developer portals. Prior to 0.17.8, the @backstage/backend-defaults package is affected by improper access control in backend action invocation. An authenticated user could invoke actions that an operator had excluded through action configuration. Existing action permissions and downstream authorization remain enforced. This issue is fixed in version 0.17.8.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00239 15th percentileScored 2026-11-07
Fix Fixed backstage (backstage): 1.54.6backend-defaults (@backstage): 0.17.8+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
backstagebackstagebefore 1.54.61.54.6Patch availableCNA
backstagebackend-defaultsbefore 0.17.80.17.8Patch availableCNA
—@backstage/backend-defaults (npm)before 0.17.80.17.8Patch availableGHSA-3xr5-8w6c-p5gw
  • backstage Vendorbackstage Affected before 1.54.6 Fixed in 1.54.6 Patch available CNA
  • backend-defaults Vendorbackstage Affected before 0.17.8 Fixed in 0.17.8 Patch available CNA
  • @backstage/backend-defaults (npm) Vendor— Affected before 0.17.8 Fixed in 0.17.8 Patch available GHSA-3xr5-8w6c-p5gw

Remediation

Update @backstage/backend-defaults to 0.17.8. The backstage package is fixed in 1.54.6.

Written with Claude Haiku 5.5 from the sources below · 2026-11-06

  • Fix · CNA backstage (backstage) Fixed in 1.54.6
  • Fix · CNA backend-defaults (@backstage) Fixed in 0.17.8
  • Fix · GHSA-3xr5-8w6c-p5gw @backstage/backend-defaults (npm) Fixed in 0.17.8 Advisory →

Vendor assessments

Red Hat

Red Hat's page for this CVE →

Not affected: 1 product
  • Red Hat

Timeline

  1. 2026-10-12 Threatist record created from CVE-2026-106495
  2. 2026-10-13 CISA SSVC decision points changed
  3. 2026-10-16 Alias added: GHSA-3xr5-8w6c-p5gw
  4. 2026-10-16 Fix available: npm/@backstage/[email protected] · GHSA-3xr5-8w6c-p5gw
  5. 2026-10-16 CVSS score added · GHSA-3xr5-8w6c-p5gw
  6. 2026-10-16 Weakness changed · GHSA-3xr5-8w6c-p5gw
  7. 2026-10-16 5 new references · GHSA-3xr5-8w6c-p5gw
  8. 2026-11-06 Affected versions changed · Red Hat
  9. 2026-11-06 CVSS score added · Red Hat

References

Advisory 1

Other 4

  • TI-2026-33119 Malware in 42 @tanstack/* packages exfiltrates cloud credentials, GitHub tokens, and SSH keys KEVCVSS 3.1CRITICAL 9.6
  • TI-2018-10499 Integer overflow in backstage kernel KEVCVSS 3.0HIGH 7.8
  • TI-2024-08998 Remote Code Execution in kedro-org/kedro CVSS 3.0CRITICAL 9.8
  • TI-2023-12294 Dragonfly2 vulnerable to hard coded cyptographic key CVSS 3.1CRITICAL 9.8
  • TI-2021-12074 Authentication vulnerability in MOSN v.0.23.0 allows attacker to escalate privileges via… CVSS 3.1CRITICAL 9.8
  • TI-2019-04061 runc through 1.0-rc6, as used in Docker before 18.09.2 and other products, allows… CVSS 3.1HIGH 8.6
See all 662 →

Sources

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