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CVE-2025-6434

nvd nist
Published: Jun 24, 2025Modified: Jun 17, 2026

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4.3
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N
Exploitability: 2.8 / Impact: 1.4
Source: 134c704f-9b21-4f2e-91b3-4a467353bcc0 (Secondary)

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 (1)

Products: Mozilla: Firefox
Mozilla
1 product
Firefox
Configuration A
1 vulnerable
Vulnerable SoftwareAffected Versions
Firefox
Before 140.0

Related CWEs

CWE-1021
Improper Restriction of Rendered UI Layers or Frames
The web application does not restrict or incorrectly restricts frame objects or UI layers that belong to another application or domain, which can lead to user confusion about which interface the user is interacting with.

References (3)

Source: security@mozilla.org
Permissions Required
Source: security@mozilla.org
Vendor Advisory
Source: security@mozilla.org

Timeline

No history available yet.