Medium severity4.3NVD Advisory· Published Jun 24, 2025· Updated Apr 13, 2026
CVE-2025-6434
CVE-2025-6434
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
1Patches
0No patches discovered yet.
Vulnerability mechanics
AI mechanics synthesis has not run for this CVE yet.
References
3- www.mozilla.org/security/advisories/mfsa2025-51/nvdVendor Advisory
- bugzilla.mozilla.org/show_bug.cginvdPermissions Required
- www.mozilla.org/security/advisories/mfsa2025-54/nvd
News mentions
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