Quick answers
- Is CVE-2026-116631 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-116631 being exploited in the wild.
- How severe is CVE-2026-116631?
- Medium severity, with a CVSS score of 5.4, published 26 October 2026.
- Which products and versions are affected?
- Mozilla Firefox for iOS before 156.1.
- Is there a fix for CVE-2026-116631?
- Yes: fixed in Firefox for iOS 156.1. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
- How is CVE-2026-116631 attacked?
- It is attacked over the network, in a web application.
- Am I affected by CVE-2026-116631?
- Check whether you run Mozilla Firefox for iOS at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.
How to fix
- Fixed in: Firefox for iOS 156.1
Technical details
A malicious website can open a tel: protocol link in a browser window showing a different website, causing the resulting phone-call prompt to appear as though the legitimate site requested the call. This is a UI spoofing vulnerability affecting the external protocol handler in Firefox for iOS. The vulnerability allows network-based attackers without special privileges to trick users into calling numbers controlled by the attacker.
Affected products
- Mozilla Firefox for iOS before 156.1
Timeline
- 2026-10-26: disclosed
- 2026-10-26: patched