CVE-2026-2634
Firefox iOS <147.4: address-bar desync enables spoofed pages.
Is CVE-2026-2634 being exploited?
Not confirmed. CVE-2026-2634 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked. EPSS currently estimates a 0.31% probability of exploitation in the next 30 days.
How severe is CVE-2026-2634?
CVE-2026-2634 is rated Critical with a CVSS score of 9.8. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-2634?
Yes. A fix has been recorded for CVE-2026-2634. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-2634 affect?
CVE-2026-2634 affects Firefox for iOS <147.4. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-2634?
Upgrade to Firefox for iOS 147.4+
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Attacker can display spoofed pages to users by desyncing address bar and content, enabling phishing.
Immediate action required