Improper access control in Mozilla products - CVE-2026-16358
Published: July 21, 2026
Vulnerability identifier: #VU138973
CSH Severity: Medium
CVSS v4.0: 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/E:U/U:Green
CVE-ID: CVE-2026-16358
CWE-ID: CWE-284
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: Mozilla
Affected software:
Mozilla Firefox
Firefox ESR
Firefox for Android
Mozilla Firefox
Firefox ESR
Firefox for Android
Detailed vulnerability description
The vulnerability allows a remote attacker to bypass site isolation.
The vulnerability exists due to a site isolation issue in the Graphics: WebRender component when rendering content. A remote attacker can convince the victim to visit a specially crafted website or URL to bypass site isolation.
How to mitigate CVE-2026-16358
Install security update from vendor's website.