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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 affects Firefox < 140.
Reserved 2025-06-20 | Published 2025-06-24 | Updated 2025-06-24 | Assigner mozillaHTTPS-Only exception screen lacked anti-clickjacking delay
hafiizh & kang ali
bugzilla.mozilla.org/show_bug.cgi?id=1955182
www.mozilla.org/security/advisories/mfsa2025-51/
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