CVE-2026-55094

HIGHPre-NVD 8.78.7—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 8.7 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.4% (34th percentile of EPSS-scored CVEs). GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, secondary
Trending — 4 sources updated this week
8.7EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.4%CVSS: 8.7Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

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 v3
8.7
EG Score
8.7HIGHmedium confidence
EG Risk
54
EG Risk 54/100CISA SSVC

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity87% × 45%
Exploitation0% × 40%
Automatability100% × 15%
CISA SSVC: Track at low or medium mission impact; Attend at high (mission-essential systems).
Action: A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.
EPSS PROB
0.4%
EPSS %ILE
34th
KEV
Not listed

CISA SSVCTrack at low or medium mission impact; Attend at high (mission-essential systems).

A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.

Exploitation none (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

September 30, 2026

Last Modified

September 30, 2026

Advisory Details (6)

Auto-updated Sep 30, 2026
Patch available. Sources: github_pr, github_commit, github_release, github.
github_release Patch Available

v100.3.0

Patch available: taskcluster/taskcluster v100.3.0

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

Access Denied

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

commit a1b0154b8235 (taskcluster/taskcluster)

Fix landed in taskcluster/taskcluster commit a1b0154b8235 — awaiting tagged release

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

feat(ui,web): Remove sift dependency and simplify filtering

Fix merged in taskcluster/taskcluster PR #8718 on 2026-06-09 — awaiting tagged release

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

Simplify web-server filtering - remove sift library · Issue #8716 · taskcluster/taskcluster · GitHub

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

Unauthenticated remote code execution in Taskcluster web-server via sift library · Advisory · taskcluster/taskcluster · GitHub

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

Vendor Advisories for CVE-2026-55094(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Weakness Classification(5)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 20× in last 7d / 20× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-10-04 03:07 UTCEG score recompute
  2. 2026-10-04 03:07 UTCGHSA enrichment
  3. 2026-10-03 14:26 UTCEPSS rescore
  4. 2026-10-03 14:01 UTCGHSA enrichment
  5. 2026-10-03 00:53 UTCEG score recompute
  6. 2026-10-03 00:53 UTCGHSA enrichment
  7. 2026-10-02 17:56 UTCEPSS rescore
  8. 2026-10-02 11:46 UTCGHSA enrichment
  9. 2026-10-01 22:37 UTCEG score recompute
  10. 2026-10-01 22:37 UTCGHSA enrichment
  11. 2026-10-01 19:50 UTCEPSS rescore
  12. 2026-10-01 09:29 UTCGHSA enrichment
  13. 2026-09-30 20:22 UTCGHSA enrichment
  14. 2026-09-30 20:01 UTCEG score recompute
  15. 2026-09-30 20:01 UTCGHSA enrichment
  16. 2026-09-30 19:26 UTCEG score recompute
  17. 2026-09-30 19:26 UTCGHSA enrichment
  18. 2026-09-30 18:25 UTCEG score recompute
  19. 2026-09-30 17:36 UTCEG score recompute
  20. 2026-09-30 17:35 UTCMITRE cvelistV5first tracked

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Frequently asked(5)

What is CVE-2026-55094?
CVE-2026-55094 is a high vulnerability published on September 30, 2026. 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…
When was CVE-2026-55094 disclosed?
CVE-2026-55094 was first published on September 30, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-55094 actively exploited?
CVE-2026-55094 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.4% probability of exploitation in the next 30 days (34th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-55094?
CVE-2026-55094 has a CVSS base score of 8.7 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-55094?
A fix for CVE-2026-55094 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-55094 are linked in the Vendor Advisories panel on this page.

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