by Kastro
Paper/Archive/CVE-2026-2634

CVE-2026-2634

Mozilla Firefox for iOS — Spoofed web content presented under trusted domains using scripted navigation on Firefox iOS

EPSS 0.4%CVSS 9.8
critical.is priorityof 100
35
CVSS 9.8 (ADP, NVD agree)9.8 / 10 × 3029.4Not in CISA KEV+300.0EPSS percentile 29.6.296 × 205.9No public exploit+100.0SSVC exploitation: none+100.0
Description · from the CVE record

Malicious scripts could cause desynchronization between the address bar and web content before a response is received in Firefox iOS, allowing attacker-controlled pages to be presented under spoofed domains. This vulnerability was fixed in Firefox for iOS 147.4.

Affected

ProductAffectedFixed inSource
Firefox for iOSsee advisory147.4CNA

Scores by source

CISA ADP9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CISA ADPSSVCExploitation: none · Automatable: yes · Technical impact: total

References

refbugzilla.mozilla.org/show_bug.cgi?id=1975529refmozilla.org/security/advisories/mfsa2026-12