CVE-2026-113030 Google CVE debrief

Who should care

Defenders responsible for Chrome browser security, web application security, and network security should assess exposure and verify web origin policy controls, especially for Chrome versions prior to 156.0.8078.47. They should also monitor for potential attacks and review compensating controls for exposed systems while remediation is scheduled and verified.

Why it matters

CVE-2026-113030 is a Medium severity improper access control vulnerability in V8 affecting Google Chrome. Defenders should verify exposure, assess web origin policy controls, and monitor for potential attacks.

• Verify web origin policy controls to prevent potential bypass
• Assess Chrome version exposure and update to 156.0.8078.47 or later
• Monitor for crafted HTML page attacks

Technical summary

The vulnerability is caused by improper access control in V8, which allows a remote attacker to potentially bypass web origin policy via a crafted HTML page. This issue affects Google Chrome versions prior to 156.0.8078.47. The NVD entry is currently unclassified. Chromium security rates this issue as Medium severity. Defenders should assess exposure and verify web origin policy controls, especially for Chrome versions prior to 156.0.8078.47. The CVE record was published on 2026-10-20T21:02:30.938Z and has not been modified since then.

Defensive priority

Defenders should prioritize verifying exposure and assessing web origin policy controls, especially for Chrome versions prior to 156.0.8078.47.

Recommended defensive actions

• Verify Chrome version and update to 156.0.8078.47 or later
• Assess web origin policy controls and configurations
• Monitor for crafted HTML page attacks
• Review compensating controls for exposed systems while remediation is scheduled and verified
• Check relevant monitoring, detection, and logs for exposed assets that need extra review
• Track exceptions, retest remediated assets, and close the item only after evidence is documented
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up

Evidence notes

Evidence is based on the official CVE Program record, NIST NVD detail page, and supplemental source references from Google Chrome release blog and Chromium issue tracker. The CVE record was published on 2026-10-20T21:02:30.938Z and has not been modified since then. Defenders should verify exposure and assess web origin policy controls, especially for Chrome versions prior to 156.0.8078.47.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.