CVE-2026-106499 MEDIUM

CVE-2026-106499: Backstage: Secret-derived values may be exposed in scaffolder task logs

Vendor Backstage
Product backstage
Weakness CWE-532 · Sensitive info in logs
Published October 6, 2026
Last update October 7, 2026

CVSS base score

4.9/10
Attack vector Network
Attack complexity Low
Privileges required High
User interaction None
Confidentiality High
Integrity None

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N

What the vulnerability does

01Description

Backstage is an open framework for building developer portals. Prior to 4.1.0, the @backstage/plugin-scaffolder-backend package could expose secret-derived values in Scaffolder task logs. Deployments that configure sensitive scaffolder.defaultEnvironment.secrets and allow an attacker to create or modify Scaffolder templates are affected. A template author could cause secret-derived values used during template iteration to be persisted and exposed to users who can access the resulting task logs. This issue is fixed in version 4.1.0.

Key dates

02Disclosure timeline

October 6, 2026 CVE published
October 7, 2026 Record updated

Related vulnerabilities

04Related CVE