CVE-2026-55094: Taskcluster

High severity, CVSS 8.7. EPSS: 0.4% chance of exploitation in the next 30 days.

Taskcluster is the task execution framework that supports Mozilla's continuous integration and release processes. Prior to version 100.3.0, Taskcluster is vulnerable to unauthenticated RCE on Taskcluster deployments with an anonymous role that exposes the GraphQL endpoint and parses filter arguments using the sift library. This issue has been patched in version 100.3.0.

Affected products

• Taskcluster Taskcluster: before 100.3.0 (fixed in 100.3.0)

Published 2026-09-30. Last modified 2026-09-30.