CVE-2025-10534

HIGH

Firefox and Thunderbird < 143.0 - Spoofing via Site Permissions Component

Title source: llm

Spoofing issue in the Site Permissions component. This vulnerability was fixed in Firefox 143 and Thunderbird 143.

Core 3

Core References

Permissions Required

Vendor Advisory

Vendor Advisory

CVSS v3 8.1

EPSS 0.0004

EPSS Percentile 10.8%

Attack Vector NETWORK

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N

Vulnrichment

Exploitation none

Automatable no

Technical Impact total

CWE

CWE-79

Status published

Products (4)

mozilla/firefox < 143.0

Mozilla/Firefox 143

mozilla/thunderbird < 143.0

Mozilla/Thunderbird 143

Published Sep 16, 2025

Tracked Since Feb 18, 2026