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Vulnerabilities

Vulnerability · CVE-2026-106495

Backstage: Improper access control in backend action invocation

Published Oct 12, 2026 · catalog updated Oct 15, 2026 · Backstage: Improper access control

Check if you run it

No confirmed exploitation is on record for CVE-2026-106495. EPSS is 0.24%. Act only if a listed version of Backstage: Improper access control is installed.

Gaps on this record

  • The stored product name is a package slug. The name on this page is taken from the title (Backstage: Improper access control).
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
Medium4.3
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.24%
Remediation
Version ranges on file
Affected products
npm @backstage · npm @backstage/backend-defaults · vendor @backstage backend-defaults · vendor backstage backstage

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.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • npm @backstageversion unspecified
  • npm @backstage/backend-defaults0 → 0.17.8
  • npm @backstage/backend-defaults< 0.17.8
  • vendor @backstage backend-defaultsversion unspecified
  • vendor backstage backstageversion unspecified

How to fix CVE-2026-106495

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2026-106495. EPSS is 0.24%. Act only if a listed version of Backstage: Improper access control is installed.

Which versions are affected?

Compare what you have installed with 0 → 0.17.8, < 0.17.8. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-284: Improper Access Control. EPSS 0.24%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

Timeline

Detection, updates, and resolution for this record.

  1. Oct 15, 2026 · GitHub Advisory Database

    Detected

    ### Impact An authenticated user could invoke actions that an operator had excluded through action configuration. Existing action permissions and downstream authorization remain enforced. ### Patches Patched in version ### Workarounds Limit access to action invocation endpoints to trusted service callers until upgrading.

  2. Oct 15, 2026 · GitHub Advisory Database

    Fix available

    @backstage/backend-defaults fixed in 0.17.8

  3. Oct 15, 2026 · GitHub Advisory Database

    Fix available

    @backstage/backend-defaults fixed in 0.17.8

  4. Oct 15, 2026 · GitHub Advisory Database

    Updated

    ### Impact An authenticated user could invoke actions that an operator had excluded through action configuration. Existing action permissions and downstream authorization remain enforced. ### Patches Patched in version ### Workarounds Limit access to action invocation endpoints to trusted service callers until upgrading.

Sources

  • CVE.orgVulnerability recordCVE-2026-106495

    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 con

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2026-106495

    30-day exploitation probability 0.2%

    first.org
  • GitHub Advisory DatabasePackage advisoryGHSA-3xr5-8w6c-p5gw

    Backstage: Improper access control in backend action invocation

    github.com
  • GitLab Advisory DatabasePackage advisoryCVE-2026-106495

    An authenticated user could invoke actions that an operator had excluded through action configuration. Existing action permissions and downstream authorization remain enforced.

    advisories.gitlab.com
  • OpenSSF OSV / OSV ScannerPackage advisoryGHSA-3xr5-8w6c-p5gw

    Backstage: Improper access control in backend action invocation

    osv.dev

References

Freshness

Last verified in this catalog Oct 18, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.