Vulnerability DatabaseCVE-2026-86853
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CVE-2026-86853
Published:September 08, 2026
Updated:September 22, 2026
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 Packages
https://github.com/mozilla-mobile/firefox-ios.git (GITHUB):
Affected version(s) =FennecAuroraL10N-v5.0b7 <firefox-v155.1
Fix Suggestion:
Update to version firefox-v155.1
Related Resources (2)
https://bugzilla.mozilla.org/show_bug.cgi?id=1847631
https://www.mozilla.org/security/advisories/mfsa2026-89/
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CVSS v4
Base Score:
5.3
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
NONE
User Interaction
PASSIVE
Vulnerable System Confidentiality
NONE
Vulnerable System Integrity
NONE
Vulnerable System Availability
LOW
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
4.3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
LOW
Weakness Type (CWE)
User Interface (UI) Misrepresentation of Critical Information
CWE-451
EPSS
Base Score:
0.17