---
id: "CVE-2026-116631"
kind: "vulnerability"
aliases: ["CVE-2026-116631"]
title: "Firefox for iOS: tel links can show a phone-call prompt for the wrong site"
severity: "medium"
cvss: 5.4
epss: null
exploited: false
status: "open"
category: "runtime"
products: []
ecosystems: []
tags: ["firefox-ios", "ios", "mobile", "runtime"]
not_affected_if: ["firefox-ios-156.1-or-later"]
published_at: "2026-10-26T19:16:30+00:00"
first_seen_at: "2026-10-26T19:32:06+00:00"
updated_at: "2026-10-26T19:34:00+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-116631", "first_seen_at": "2026-10-26T19:32:06+00:00"}]
---

# Firefox for iOS: tel links can show a phone-call prompt for the wrong site

A malicious web page could open a tel link in a window showing a different website, so the phone-call prompt appears to come from that other site. An attacker can trick a user into placing a call they did not expect from a site they trust.

_Summary, check and fix written by a model from the sources; labelled as such._

## How to check

- Check the Firefox for iOS version in Settings or the App Store; versions below `156.1` are affected.

## Fix

- Update Firefox for iOS to `156.1` or later.

## Timeline

- 2026-10-26T19:32:06+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-116631

## From the sources

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.

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