Vulnerability in @Backstage Backend-Defaults
CVE-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 configuration. Existing action permissions and downstream authorization remain enforced. This issue is fixed in version 0.17.8.
Published .
CVSS v3 metric
CVSS v3 base score 4.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
- @Backstage Backend-Defaults — versions < 0.17.8
- Backstage — versions < 1.54.6
Weakness classification (CWE)
References
Frequently asked questions
- What is CVE-2026-106495?
- CVE-2026-106495 is a medium-severity vulnerability in @Backstage Backend-Defaults, classified under Improper Access Control. CVSS score: 4.3/10. Published 2026-10-12.
- How severe is CVE-2026-106495?
- Medium severity. CVSS v3 base score is 4.3 out of 10.