High [CVE-2026-76033] Site isolation bypass due to inappropriate CORS implementation
This high-severity Red Hat Linux advisory covers CVE-2026-76033.
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Summary
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. This Important flaw in chromium-browser allows a remote attacker to bypass site isolation after an initial compromise of the browser's renderer process.
This could lead to unauthorized access to sensitive data from other websites, significantly undermining a core browser security boundary. Red Hat severity: Important — CVSS 8.7 (CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N).
Weakness: CWE-653.
Affected versions
No affected-version range was extracted from the source record. The vendor advisory is authoritative — check it before change work.
Official advisory · medium-confidence parse· fetched 1 hour ago·verify at source
Fixed versions
No fixed release is recorded yet. That does not prove no patch exists — confirm against the vendor advisory.
Official advisory · medium-confidence parse· fetched 1 hour ago·verify at source
Mitigation
The source record does not include mitigation steps. That is not a statement that no fix exists — read the vendor advisory below for the authoritative guidance.
Official advisory · medium-confidence parse· fetched 1 hour ago·verify at source
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