Vulnerability Details CVE-2026-86853
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.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.003
EPSS Ranking 18.9%
CVSS Severity
CVSS v3 Score 4.3
References
Products affected by CVE-2026-86853
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cpe:2.3:a:mozilla:firefox_mobile:-
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cpe:2.3:a:mozilla:firefox_mobile:102.0
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cpe:2.3:a:mozilla:firefox_mobile:119.0
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cpe:2.3:a:mozilla:firefox_mobile:120.0
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cpe:2.3:a:mozilla:firefox_mobile:127.0
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cpe:2.3:a:mozilla:firefox_mobile:129.0
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cpe:2.3:a:mozilla:firefox_mobile:14.0
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cpe:2.3:a:mozilla:firefox_mobile:144.0
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cpe:2.3:a:mozilla:firefox_mobile:147.0
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cpe:2.3:a:mozilla:firefox_mobile:147.1
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cpe:2.3:a:mozilla:firefox_mobile:147.2
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cpe:2.3:a:mozilla:firefox_mobile:147.2.1
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cpe:2.3:a:mozilla:firefox_mobile:147.3
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cpe:2.3:a:mozilla:firefox_mobile:147.4
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cpe:2.3:a:mozilla:firefox_mobile:147.5
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cpe:2.3:a:mozilla:firefox_mobile:148.0
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cpe:2.3:a:mozilla:firefox_mobile:148.1
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cpe:2.3:a:mozilla:firefox_mobile:148.2
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cpe:2.3:a:mozilla:firefox_mobile:148.3
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cpe:2.3:a:mozilla:firefox_mobile:149.0
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cpe:2.3:a:mozilla:firefox_mobile:149.1
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cpe:2.3:a:mozilla:firefox_mobile:149.2
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cpe:2.3:a:mozilla:firefox_mobile:149.3
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cpe:2.3:a:mozilla:firefox_mobile:15.0
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cpe:2.3:a:mozilla:firefox_mobile:15.1
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cpe:2.3:a:mozilla:firefox_mobile:150.0
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cpe:2.3:a:mozilla:firefox_mobile:150.1
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cpe:2.3:a:mozilla:firefox_mobile:150.2
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cpe:2.3:a:mozilla:firefox_mobile:150.3
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cpe:2.3:a:mozilla:firefox_mobile:151.0
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cpe:2.3:a:mozilla:firefox_mobile:151.1
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cpe:2.3:a:mozilla:firefox_mobile:151.2
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cpe:2.3:a:mozilla:firefox_mobile:151.3
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cpe:2.3:a:mozilla:firefox_mobile:151.3.2
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cpe:2.3:a:mozilla:firefox_mobile:152.0
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cpe:2.3:a:mozilla:firefox_mobile:152.3
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cpe:2.3:a:mozilla:firefox_mobile:152.4
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cpe:2.3:a:mozilla:firefox_mobile:153.0
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cpe:2.3:a:mozilla:firefox_mobile:153.1
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cpe:2.3:a:mozilla:firefox_mobile:153.2
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cpe:2.3:a:mozilla:firefox_mobile:153.3
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cpe:2.3:a:mozilla:firefox_mobile:154.0
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cpe:2.3:a:mozilla:firefox_mobile:154.1
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cpe:2.3:a:mozilla:firefox_mobile:155.0
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cpe:2.3:a:mozilla:firefox_mobile:16.0
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cpe:2.3:a:mozilla:firefox_mobile:16.1
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cpe:2.3:a:mozilla:firefox_mobile:16.2
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cpe:2.3:a:mozilla:firefox_mobile:17.0
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cpe:2.3:a:mozilla:firefox_mobile:17.1
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cpe:2.3:a:mozilla:firefox_mobile:17.2
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cpe:2.3:a:mozilla:firefox_mobile:17.3
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cpe:2.3:a:mozilla:firefox_mobile:18.0
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cpe:2.3:a:mozilla:firefox_mobile:18.1
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cpe:2.3:a:mozilla:firefox_mobile:18.2
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cpe:2.3:a:mozilla:firefox_mobile:19.0
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cpe:2.3:a:mozilla:firefox_mobile:19.1
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cpe:2.3:a:mozilla:firefox_mobile:20.0
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cpe:2.3:a:mozilla:firefox_mobile:20.1
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cpe:2.3:a:mozilla:firefox_mobile:20.2
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cpe:2.3:a:mozilla:firefox_mobile:21.0
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cpe:2.3:a:mozilla:firefox_mobile:22.0
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cpe:2.3:a:mozilla:firefox_mobile:23.0
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cpe:2.3:a:mozilla:firefox_mobile:24.0
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cpe:2.3:a:mozilla:firefox_mobile:24.1
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cpe:2.3:a:mozilla:firefox_mobile:25.0
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cpe:2.3:a:mozilla:firefox_mobile:25.1
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cpe:2.3:a:mozilla:firefox_mobile:26.0
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cpe:2.3:a:mozilla:firefox_mobile:27.0
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cpe:2.3:a:mozilla:firefox_mobile:28.0