CVE-2026-106499

Published: Oct 6, 2026Modified: Oct 15, 2026

4.9

Vector

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

Exploitability: 1.2 / Impact: 3.6

Source: security-advisories@github.com (Secondary)

Description

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.

Affected (2)

Products: Linuxfoundation: Backstage/plugin Scaffolder Backend, Backstage

Linuxfoundation

2 products

Backstage/plugin Scaffolder Backend

Configuration A

1 vulnerable

Vulnerable Software	Affected Versions
Linuxfoundation Backstage/plugin Scaffolder Backend	version < 4.1.0

Configuration B

1 vulnerable

Vulnerable Software	Affected Versions
Linuxfoundation Backstage	version < 1.54.6

Related CWEs

Insertion of Sensitive Information into Log File

Information written to log files can be of a sensitive nature and give valuable guidance to an attacker or expose sensitive user information.

References (3)

https://github.com/backstage/backstage/commit/dc30fae2d96cb1606d36cc40b242f9b9e539bd70

Source: security-advisories@github.com

Patch

https://github.com/backstage/backstage/releases/tag/v1.54.6

Source: security-advisories@github.com

PatchRelease Notes

https://github.com/backstage/backstage/security/advisories/GHSA-mfvq-x7vr-rgqg

Source: security-advisories@github.com

MitigationVendor Advisory

Timeline

No history available yet.