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CVE PROGRAM SOURCE RECORD4.3 Medium

CVE-2025-6434

HTTPS-Only exception screen lacked anti-clickjacking delay

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.

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

Mozilla Firefox

  • 140 to ≤ *unaffected

Mozilla Thunderbird

  • 140 to ≤ *unaffected

References