Bug 2524120 (CVE-2026-78949)

Summary: CVE-2026-78949 chromium-browser: Google Chrome CustomTabs: Cross-origin data disclosure
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 CustomTabs. A local attacker, by using a co-installed application, could exploit an observable discrepancy within CustomTabs. This vulnerability could allow the attacker to obtain sensitive cross-origin data, leading to unauthorized information disclosure.
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Bug Depends On: 2524890, 2524891    
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Description OSIDB Bzimport 2026-08-25 21:15:42 UTC
Observable discrepancy in CustomTabs in Google Chrome on on Android prior to 152.0.7977.65 allowed a local attacker to obtain cross-origin data via a co-installed app. (Chromium security severity: Medium)