CVE-2026-19410Network attack vector

Unreviewed code execution via webhook suppression

Published Aug 31, 2026 · Updated Aug 31, 2026

Incorrect authorization in Google Cloud Build before 2026-06-24 allows remote authenticated users to execute unreviewed build code. GitHub Trigger Comment Control fails to preserve the reviewed webhook state, so webhook suppression bypasses the approval check before build execution. Exploitation requires low privileges and passive user interaction; successful use runs attacker-selected, unreviewed code inside the managed build environment.

CVSS severity9.4
Critical
EPSS probability0.20%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Incorrect authorization in Google Cloud Build before 2026-06-24 allows remote authenticated users to execute unreviewed build code. GitHub Trigger Comment Control fails to preserve the reviewed webhook state, so webhook suppression bypasses the approval check before build execution. Exploitation requires low privileges and passive user interaction; successful use runs attacker-selected, unreviewed code inside the managed build environment.

The record

CVE
CVE-2026-19410
Published
Aug 31, 2026
Updated
Aug 31, 2026
Vendor
Google Cloud
Product
Cloud Build
Classifications
CWE-345, CWE-367, T1190
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 31, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 31, 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=0 <2026-06-24

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Google Cloud · Cloud Buildversion=0 <2026-06-24

Published CVSS scores

9.4Google Cloud CNACVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H

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.

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

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-345Insufficient Verification of Data Authenticity
CWE-367Time-of-check Time-of-use (TOCTOU) Race Condition
T1190Exploit Public-Facing Application

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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