Improper Authorization in Google Chromium - CVE-2026-78953
Published: August 26, 2026
Vulnerability identifier: #VU145574
CSH Severity: Medium
CVSS v4: 5.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-78953
CWE-ID: CWE-285
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to bypass authorization restrictions.
The vulnerability exists due to improper access control in SiteIsolation when rendering web content. A remote attacker can cause the browser to process crafted content to bypass authorization restrictions.
User interaction is required to visit a crafted webpage.
Affected software
Google Chromium
Microsoft Edge
Google Chrome
Debian Linux
chromium (Debian package)
Microsoft Edge
Google Chrome
Debian Linux
chromium (Debian package)
How to mitigate CVE-2026-78953
Install security update from vendor's website.
Google Chromium - update to 152.0.7977.64
Microsoft Edge - update to 152.0.4191.53
Google Chrome - addressed in versions 151.0.7922.175, 152.0.7977.64
chromium (Debian package) - update to 152.0.7977.75-1~deb13u1
Microsoft Edge - update to 152.0.4191.53
Google Chrome - addressed in versions 151.0.7922.175, 152.0.7977.64
chromium (Debian package) - update to 152.0.7977.75-1~deb13u1