CVE-2026-86853 — Repeated external URL scheme launches could potentially cause a denial of service in Firefox for iOS

CVE-2026-86853

Repeated external URL scheme launches could potentially cause a denial of service in Firefox for iOS PUBLISHED

Description (CNA)

A malicious webpage could repeatedly trigger external URL schemes, causing system prompts or external application launches. This could make Firefox for iOS temporarily unusable until the page is closed. This vulnerability was fixed in Firefox for iOS 155.1.

Affected (CNA)

Vendor / product	Versions
Mozilla / Firefox for iOS	unaffected 155.1 through *

CWE

No CWE identifiers supplied.

References

https://bugzilla.mozilla.org/show_bug.cgi?id=1847631
https://www.mozilla.org/security/advisories/mfsa2026-89/

ADP enrichment

CISA-ADP

No English description supplied.

No references supplied.