What’s Vulnerable › Vulnerabilities

CVE-2026-55094: Taskcluster: Unauthenticated remote code execution in `web-server` via GraphQL `filter` argument (sift `$where`)

• Severity: high (CVSS 8.7 v4.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-30 · updated 2026-09-30
• Weakness: CWE-20

Description

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: before 100.3.0

References

• https://bugzilla.mozilla.org/show_bug.cgi?id=2045091
• https://github.com/taskcluster/taskcluster/commit/a1b0154b8235937657c2ded127f193b564e2334b
• https://github.com/taskcluster/taskcluster/issues/8716
• https://github.com/taskcluster/taskcluster/pull/8718
• https://github.com/taskcluster/taskcluster/releases/tag/v100.3.0
• https://github.com/taskcluster/taskcluster/security/advisories/GHSA-ccv5-c45x-2q38

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