CVE-2025-23108: Firefox Mobile iOS Full Address Bar Spoof Using Open in New Tab and Javascript URI

Severity: medium (CVSS 4.3 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: 2025-01-11 · updated 2026-10-05
Weakness: CWE-79

Description

Opening Javascript links in a new tab via long-press in the Firefox iOS client could result in a malicious script spoofing the URL of the new tab. This vulnerability was fixed in Firefox for iOS 134.

Affected products

Mozilla Firefox: before 134.0 — fixed in 134.0

How to fix

Upgrade to a fixed version: Mozilla Firefox 134.0. Check the vendor advisory for mitigations.

References

https://bugzilla.mozilla.org/show_bug.cgi?id=1933172
https://www.mozilla.org/security/advisories/mfsa2025-06/

Get alerted when CVE-2025-23108 or the next vulnerability affects your stack