CVE-2026-55094

high

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.

References

https://github.com/taskcluster/taskcluster/security/advisories/GHSA-ccv5-c45x-2q38

https://github.com/taskcluster/taskcluster/releases/tag/v100.3.0

https://github.com/taskcluster/taskcluster/pull/8718

https://github.com/taskcluster/taskcluster/issues/8716

https://github.com/taskcluster/taskcluster/commit/a1b0154b8235937657c2ded127f193b564e2334b

https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-90208

https://bugzilla.mozilla.org/show_bug.cgi?id=2045091

Details

Source: Mitre, NVD

Published: 2026-09-30

Updated: 2026-09-30

Risk Information

CVSS v2

Base Score: 7.5

Vector: CVSS2#AV:N/AC:L/Au:N/C:P/I:P/A:P

Severity: High

CVSS v3

Base Score: 9.8

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Severity: Critical

CVSS v4

Base 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

Severity: High

EPSS

EPSS: 0.00681