Security Advisory

CVE-2025-6434

CVE vulnerability detail — eXtreme Datacenter Security Operations

Published 2025-06-24 12:28:04

Last updated 2026-04-13 14:31:11

Assigner mozilla

State PUBLISHED

Description

The exception page for the HTTPS-Only feature, displayed when a website is opened via HTTP, lacked an anti-clickjacking delay, potentially allowing an attacker to trick a user into granting an exception and loading a webpage over HTTP. This vulnerability was fixed in Firefox 140 and Thunderbird 140.

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