What is CVE-2026-116631?

CVE-2026-116631 is a medium-severity vulnerability, classified under User Interface (UI) Misrepresentation of Critical Information. CVSS score: 5.4/10. Published 2026-10-26.

How severe is CVE-2026-116631?

Medium severity. CVSS v3 base score is 5.4 out of 10.

CVE-2026-116631

CVE-2026-116631

A malicious web page could open a tel link in a window that was showing a different website, causing the phone-call prompt to appear as if that site had requested the call. This vulnerability was fixed in Firefox for iOS 156.1.

Published 2026-10-26.

CVSS v3 metric

CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:L.

EPSS exploit prediction

No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.

Weakness classification (CWE)

CWE-451 — User Interface (UI) Misrepresentation of Critical Information

References

bugzilla.mozilla.org/show_bug.cgi
www.mozilla.org/security/advisories/mfsa2026-117/

Frequently asked questions

What is CVE-2026-116631?: CVE-2026-116631 is a medium-severity vulnerability, classified under User Interface (UI) Misrepresentation of Critical Information. CVSS score: 5.4/10. Published 2026-10-26.
How severe is CVE-2026-116631?: Medium severity. CVSS v3 base score is 5.4 out of 10.