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.

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Fixes

Solution

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Workaround

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History

Tue, 08 Sep 2026 17:30:00 +0000

Type Values Removed Values Added
First Time appeared Mozilla
Mozilla firefox For Ios
Vendors & Products Mozilla
Mozilla firefox For Ios

Tue, 08 Sep 2026 16:30:00 +0000

Type Values Removed Values Added
Weaknesses CWE-451
Metrics cvssV3_1

{'score': 4.3, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L'}

ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Tue, 08 Sep 2026 15:30:00 +0000

Type Values Removed Values Added
Description 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.
Title Repeated external URL scheme launches could potentially cause a denial of service in Firefox for iOS
References

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cve-icon MITRE

Status: PUBLISHED

Assigner: mozilla

Published:

Updated: 2026-09-08T15:48:03.190Z

Reserved: 2026-09-08T15:03:57.380Z

Link: CVE-2026-86853

cve-icon Vulnrichment

Updated: 2026-09-08T15:47:35.806Z

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-09-08T16:18:37.703

Modified: 2026-09-08T19:07:12.210

Link: CVE-2026-86853

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-09-08T17:15:17Z

Weaknesses