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.
References6
- bugzilla.mozilla.org/show_bug.cgi?id=2045091
- github.com/taskcluster/taskcluster/commit/a1b0154b8235937657c2d…
- github.com/taskcluster/taskcluster/issues/8716
- github.com/taskcluster/taskcluster/pull/8718
- github.com/taskcluster/taskcluster/releases/tag/v100.3.0
- github.com/taskcluster/taskcluster/security/advisories/GHSA-ccv…
Metrics
- CVSS 4.0
-
8.7
HIGH
Score source: CNA
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:X/V:X/RE:X/U:X - EPSS — exploit probability
- 0% percentile: 37 · as of 10 November 2026
- CWE
- CWE-20CWE-94CWE-95CWE-250CWE-306
Could this be exploited in your environment?
A patch closes the known hole. A penetration test shows what an attacker can still reach — with proof.