CVE-2026-116631: External protocol handler (tel:) address bar spoof

Severity: medium (CVSS 5.4 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-10-26 · updated 2026-10-27
Weakness: CWE-451

Description

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.

References

https://bugzilla.mozilla.org/show_bug.cgi?id=1297353
https://www.mozilla.org/security/advisories/mfsa2026-117/

Get alerted when CVE-2026-116631 or the next vulnerability affects your stack