CVE-2026-110160 Google CVE debrief

Who should care

Defenders responsible for managing Google Chrome deployments, particularly those in environments where site isolation is critical, should assess exposure and prioritize updates. This includes IT and security teams managing Chrome installations in enterprise environments, especially where site isolation is crucial for protecting sensitive data and preventing lateral movement of attacks. Additionally, security teams should review the vulnerability's impact

Why it matters

Defenders should prioritize verifying and updating Google Chrome due to a missing authorization vulnerability in ReadingMode, which could allow a remote attacker to bypass site isolation. This issue requires attention from those managing Chrome deployments, especially in environments where site isolation is crucial.

• Potential bypass of site isolation
• Increased risk of unauthorized access
• Need for verification of Chrome version and exposure
• Prioritization of updates for vulnerable deployments

Technical summary

The vulnerability exists in Google Chrome's ReadingMode prior to version 155.0.8059.79, allowing a remote attacker who has compromised the renderer process and leveraged social engineering to potentially bypass site isolation via a crafted HTML page. The issue arises from a lack of proper authorization checks within the ReadingMode component. This could enable an attacker to bypass site isolation, a critical security feature designed to prevent malicious activities. The vulnerability was reported with a High severity rating in the Chromium security assessment.

Defensive priority

Defenders should prioritize verifying and updating Google Chrome to version 155.0.8059.79 or later, and assess exposure for users who may have accessed crafted HTML pages.

Recommended defensive actions

• Verify and update Google Chrome to version 155.0.8059.79 or later
• Assess exposure for users who may have accessed crafted HTML pages
• Monitor for potential bypass of site isolation
• 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

The CVE record and source item provide details on the vulnerability, including its existence in Google Chrome prior to version 155.0.8059.79 and the potential for a remote attacker to bypass site isolation.

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.