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Vulnerability record · CVE-2026-55094 · published 30 September 2026

CVE-2026-55094: Improper input validation vulnerability

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.

8.7 CVSS 4.0 High CWE-20 · Improper input validationCWE-94 · Code injection Deferred
8.7CVSS 4.0 base score
-EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
6References
30 Sep 2026Last modified by NVD

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.

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:

References

LinkTags
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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Source: NIST National Vulnerability Database (record CVE-2026-55094), CISA KEV, FIRST EPSS. This page is refreshed as NVD updates the record.