Medium · 5.4 CVE-2026-81267 EUVD-2026-68739GHSA-pp56-4328-qwfp

Stalled popup navigation could allow address bar origin spoofing in Firefox for iOS

Published Aug 31, 2026 · Updated Aug 31, 2026 · Assigned by mozilla

Vendor: Mozilla Product: Firefox for iOS Platform: iOS Category: Browsers

Description

A malicious webpage could stall a popup's cross-origin navigation after commit, causing the address bar to display the destination origin while continuing to render attacker-controlled content. This vulnerability was fixed in Firefox for iOS 155.0.

Affected products

Vendor	Product	Affected	Fixed
Mozilla	Firefox for iOS	—	155.0

Advisories 1

WID-SEC-2026-3103 Mozilla Firefox: Schwachstelle ermöglicht Darstellen falscher Informationen BSI CERT-Bund (WID) · Aug 31, 2026

References

https://bugzilla.mozilla.org/show_bug.cgi?id=2052758
https://www.mozilla.org/security/advisories/mfsa2026-81/