Bug 2530433 (CVE-2026-87550)

Summary: CVE-2026-87550 chromium-browser: Google Chrome: Web origin policy bypass due to improper CSS encoding
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedKeywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in Google Chrome. A remote attacker could exploit improper encoding or escaping of output within the browser's Cascading Style Sheets (CSS) component. By delivering a specially crafted HTML page, the attacker could potentially bypass the web origin policy. This policy is a critical security mechanism designed to prevent malicious websites from accessing or manipulating content from other domains.
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Bug Depends On: 2542201, 2542202, 2542206    
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Description OSIDB Bzimport 2026-09-09 01:14:18 UTC
Improper encoding or escaping of output in CSS in Google Chrome prior to 153.0.8010.36 allowed a remote attacker to potentially bypass web origin policy via a crafted HTML page. (Chromium security severity: Medium)