PT-2026-21689 · Mozilla · Firefox For Ios

Renwa · Published 2026-02-24 · Updated 2026-03-01 · CVE-2026-2634

Positive Technologies (AI Summary)

CVSS v3.1

9.8

Critical

Base vector

AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Name of the Vulnerable Software and Affected Versions Firefox for iOS versions prior to 147.4

Description A flaw exists in Firefox for iOS that could allow malicious scripts to cause a mismatch between the address bar display and the actual web content. This could lead to a user being presented with a webpage controlled by an attacker while believing they are on a legitimate, spoofed domain.

Recommendations Update Firefox for iOS to version 147.4 or later.

Fix

UI Misrepresentation of Critical Information

Weakness Enumeration

CWE-451

Related Identifiers

CVE-2026-2634

Affected Products

Firefox For Ios

References · 11

• https://mozilla.org/security/advisories/mfsa2026-12 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-2634 · Security Note
• https://osv.dev/vulnerability/UBUNTU-CVE-2026-2634 · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2026-2634 · Vendor Advisory
• https://ubuntu.com/security/CVE-2026-2634 · Vendor Advisory
• https://cve.org/CVERecord?id=CVE-2026-2634 · Security Note
• https://twitter.com/RenwaX23/status/2026388391164604758 · Twitter Post
• https://twitter.com/cracbot/status/2028062799210139989 · Twitter Post
• https://twitter.com/CVEnew/status/2026676473462141083 · Twitter Post
• https://bugzilla.mozilla.org/show_bug.cgi?id=1975529 · Note
• https://twitter.com/cracbot/status/2027700488884605341 · Twitter Post