Bug 2518270 (CVE-2026-76033)

Summary: CVE-2026-76033 chromium-browser: Google Chrome: Site isolation bypass due to inappropriate CORS implementation
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security <prodsec-ir-bot>
Status: NEW --- QA Contact:
Severity: high Docs Contact:
Priority: high    
Version: unspecifiedKeywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in Google Chrome's handling of Cross-Origin Resource Sharing (CORS). A remote attacker, who has already compromised the browser's renderer process, could exploit this vulnerability by using a specially crafted HTML page. This could allow the attacker to bypass site isolation, a security feature designed to prevent malicious websites from accessing data from other websites, potentially leading to unauthorized data access.
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Bug Depends On: 2519461, 2519462    
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Description OSIDB Bzimport 2026-08-18 20:52:12 UTC 
Inappropriate implementation in CORS in Google Chrome prior to 151.0.7922.169 allowed a remote attacker who had compromised the renderer process to bypass site isolation via a crafted HTML page. (Chromium security severity: High)