CVE-2026-55094: Taskcluster: Unauthenticated remote code execution in `web-server` via GraphQL `filter` argument (sift `$where`)
Published Sep 30, 2026
·Updated
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 Software
1 affected component
Mozilla Taskcluster<100.3.0
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade
Taskclusterto a version that resolves this vulnerability.Fixed in 100.3.0
Event History
Sep 30, 2026
CVE Published
via MITRE·05:22 PM
Data Sourced
via MITRE·05:22 PM
DescriptionWeakness
Data Sourced
via NVD·06:18 PM
DescriptionSeverityWeakness