Unintended Proxy or Intermediary in Google Chromium - CVE-2026-87502
Published: September 9, 2026
Vulnerability identifier: #VU148676
CSH Severity: Low
CVSS v4: 5.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-87502
CWE-ID: CWE-441
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to cause the browser to perform unauthorized actions.
The vulnerability exists due to a confused deputy condition in the Fullscreen feature when handling fullscreen requests. A remote attacker can trick a victim into interacting with fullscreen content to cause the browser to perform unauthorized actions.
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-2026-87502
Install security update from vendor's website.
Google Chromium - update to 153.0.8010.36
Microsoft Edge - update to 153.0.4234.32
Google Chrome - update to 153.0.8010.36
chromium (Debian package) - update to 153.0.8010.47-2~deb13u1
Microsoft Edge - update to 153.0.4234.32
Google Chrome - update to 153.0.8010.36
chromium (Debian package) - update to 153.0.8010.47-2~deb13u1