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.

Attack Vector Network

Attack Complexity Low

Privileges Required None

Attack Requirements None

User Interaction None

Vulnerable System Confidentiality Impact High

Vulnerable System Integrity Impact None

Vulnerable System Availability Impact None

Subsequent System Confidentiality Impact None

Subsequent System Integrity Impact None

Subsequent System Availability Impact None

No CVSS v3.1

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

The EPSS score is 0.00681.

Exploitation none

Automatable yes

Technical Impact partial

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
taskcluster taskcluster affected
Version Status Constraints
< 100.3.0 affected —

No data.

No data.

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Advisories

No advisories yet.

Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

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

Thu, 01 Oct 2026 16:00:00 +0000

Type Values Removed Values Added
First Time appeared Taskcluster
Taskcluster taskcluster
Vendors & Products Taskcluster
Taskcluster taskcluster

Wed, 30 Sep 2026 20:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Wed, 30 Sep 2026 17:45:00 +0000

Type Values Removed Values Added
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.
Title Taskcluster: Unauthenticated remote code execution in `web-server` via GraphQL `filter` argument (sift `$where`)
Weaknesses CWE-20
CWE-250
CWE-306
CWE-94
CWE-95
References
Metrics cvssV4_0

{'score': 8.7, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N'}

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published:

Updated: 2026-09-30T19:12:22.456Z

Reserved: 2026-06-16T14:41:54.578Z

Link: CVE-2026-55094

cve-icon Vulnrichment

Updated: 2026-09-30T19:12:15.308Z

cve-icon NVD

Status : Deferred

Published: 2026-09-30T18:18:37.387

Modified: 2026-09-30T20:17:32.590

Link: CVE-2026-55094

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-10-01T15:38:41Z

Weaknesses