PT-2026-61910 · Mozilla · Firefox+1

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CVE-2026-16398

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Published

2026-07-21

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Updated

2026-08-31

CVSS v3.1

7.5

High

VectorAV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Name of the Vulnerable Software and Affected Versions Firefox versions prior to 153 Thunderbird versions prior to 153
Description A site isolation issue exists within the Graphics component. Site isolation is a security mechanism that ensures web pages from different sites are processed in separate processes to prevent one site from accessing data from another.
Recommendations Update Firefox to version 153. Update Thunderbird to version 153.

Fix

Information Disclosure

Origin Validation Error

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Weakness Enumeration

Related Identifiers

CVE-2026-16398
OPENSUSE-SU-2026:11358-1
OPENSUSE-SU-2026:11373-1
OPENSUSE-SU-2026:21713-1
SUSE-SU-2026:23411-1

Affected Products

Firefox
Thunderbird