CVE-2026-55094Network attack vectorHinoki check available

Unauthenticated code execution via GraphQL sift filtering

Published Sep 30, 2026 · Updated Sep 30, 2026

Remote code execution in Mozilla Taskcluster before 100.3.0 allows remote attackers to run code through a GraphQL filter argument. The web-server passes the JSON filter to sift, whose $where operator evaluates JavaScript supplied in the filter rather than treating it solely as search data. Exploitation requires a deployment whose anonymous role exposes the affected GraphQL endpoint; execution occurs in the web-server process.

CVSS severityUnavailable
Unscored
EPSS probability0.42%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Remote code execution in Mozilla Taskcluster before 100.3.0 allows remote attackers to run code through a GraphQL filter argument. The web-server passes the JSON filter to sift, whose $where operator evaluates JavaScript supplied in the filter rather than treating it solely as search data. Exploitation requires a deployment whose anonymous role exposes the affected GraphQL endpoint; execution occurs in the web-server process.

The record

CVE
CVE-2026-55094
Published
Sep 30, 2026
Updated
Sep 30, 2026
Vendor
Hueniverse
Product
Taskcluster
Classifications
T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 30, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 30, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 100.3.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Hueniverse · Taskclusterversion=< 100.3.0

Published CVSS scores

No CVSS assessment is available in this record.

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Activity data is delayed. The latest report is Sep 28, 2026.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1190Exploit Public-Facing Application

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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