CVE-2026-106502: Backstage: Sensitive information may be exposed in Scaffolder task failure events

Description

Backstage is an open framework for building developer portals. Prior to 4.1.0, the @backstage/plugin-scaffolder-backend package could expose sensitive information in Scaffolder task failure events. Under specific template and failure conditions, an authenticated user may retrieve backend-managed credentials used during task execution from affected task events. This issue is fixed in version 4.1.0.

CVSS vector

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

Attack vector

Network

Complexity

High

Privileges

Low

User interaction

None

Confidentiality

High

Integrity

None

Availability

None

Scope

Unchanged

Exploitation

Is it being used?

Exploit prediction (EPSS)0.3% · higher than 22% of CVEs

Exploited in the wildNo evidence yet

CISA KEVNot listed

Ransomware campaign useNot known

Affected products

Which versions

BA

backstage · backstage

< 1.54.6 · source: vendor, NVD

PL

plugin-scaffolder-backend · @backstage

< 4.1.0 · source: vendor

BA

Backstage/plugin-scaffolder-backend · Linuxfoundation

before 4.1.0 · source: NVD