What is CVE-2026-106506?

CVE-2026-106506 is a medium-severity vulnerability in @Backstage Plugin-Scaffolder-Backend, classified under CWE-202. CVSS score: 5.3/10. Published 2026-10-06.

How severe is CVE-2026-106506?

Medium severity. CVSS v3 base score is 5.3 out of 10.

Vulnerability in @Backstage Plugin-Scaffolder-Backend

CVE-2026-106506

Backstage is an open framework for building developer portals. Prior to 4.1.0, the @backstage/plugin-scaffolder-backend package is affected by improper input validation in scaffolder task list ordering. An authenticated Backstage user with permission to create and read relevant scaffolder tasks may be able to infer confidential task data under specific conditions. Successful exploitation requires retained task secrets, visibility of a target task, knowledge of the secret structure, and repeated requests. This issue is fixed in version 4.1.0.

Published 2026-10-06 · last modified 2026-10-07.

CVSS v3 metric

CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:N/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 Plugin-Scaffolder-Backend — versions < 4.1.0
Backstage — versions < 1.54.6

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2026-106506?: CVE-2026-106506 is a medium-severity vulnerability in @Backstage Plugin-Scaffolder-Backend, classified under CWE-202. CVSS score: 5.3/10. Published 2026-10-06.
How severe is CVE-2026-106506?: Medium severity. CVSS v3 base score is 5.3 out of 10.