CVE-2026-81267

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

State: Published
Severity: 5.4 Medium
Published: Aug 31, 2026
Updated: Aug 31, 2026
Reserved: Aug 26, 2026

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.

Scores

CVSS	Score	Vector	Source
3.1	5.4 Medium	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:L	CISA-ADP

Weaknesses

CWE-451 User Interface (UI) Misrepresentation of Critical Information

Affected Products

Product	Versions
Firefox for iOSMozilla	155.0 and laterNot affected

References

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

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