High 8.7Published Sep 30, 2026

CVE-2026-55094Taskcluster: Unauthenticated remote code execution in `web-server` via GraphQL `filter` argument (sift `$where`)

Updated under an hour ago (2026-10-19 09:10 UTC)

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It affects taskcluster. Add what you run to find out whether that includes you.

EPSS puts the chance of exploitation in the next 30 days at 0.42%, higher than 35% of scored CVEs.

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Exploited in the last 30 days

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: 8.7 HIGH (v4.0, 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
Weakness (CWE): CWE-20, CWE-94, CWE-95, CWE-250, CWE-306
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): 0.42% (percentile 35)
Assigned by: GitHub_M
NVD analysis: Deferred
Record last updated: Sep 30, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

taskcluster taskcluster taskcluster:taskcluster (from the name)	before 100.3.0	CNA record

References

https://github.com/taskcluster/taskcluster/security/advisories/GHSA-ccv5-c45x-2q38x-refsource-confirm
https://github.com/taskcluster/taskcluster/issues/8716x-refsource-misc
https://github.com/taskcluster/taskcluster/pull/8718x-refsource-misc
https://github.com/taskcluster/taskcluster/commit/a1b0154b8235937657c2ded127f193b564e2334bx-refsource-misc
https://bugzilla.mozilla.org/show_bug.cgi?id=2045091x-refsource-misc
https://github.com/taskcluster/taskcluster/releases/tag/v100.3.0x-refsource-misc

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.