CVE-2026-55094
Taskcluster is the task execution framework that supports Mozilla's continuous integration and release processes.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (0.42%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
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
- 8.7 HIGHCVSS: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/M
- EPSS
- 0.42% probability · 36th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-20, CWE-94, CWE-95, CWE-250, CWE-306
- Source
- security-advisories@github.com
EPSS moved from 0.7% on 1 October 2026 to 0.4% on 26 October 2026.
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
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.