CVE-2026-86853
mediumA malicious webpage could repeatedly trigger external URL schemes, causing system prompts or external application launches.
Vendor / product: Mozilla — firefox mobile
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.
CVSS
4.3
4.3 (CVSS v3.1)
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L Severity source: NVD CVSS v3.1 (134c704f-9b21-4f2e-91b3-4a467353bcc0)
Timeline (UTC)
Published: 2026-09-08 16:18
Modified: 2026-10-05 17:09
NVD status: Analyzed
Last synced 2 days ago
Verified against the source API 2026-10-27 06:51 UTC
Exploitation
Not listed in CISA KEV (as of last catalog sync)
Absence from KEV does not mean a CVE is not exploited. Exploitation status: unknown (no authoritative evidence in our sources).
Affected products
mozilla / firefox_mobile <155.1
Weakness classification (CWE)
Source: NVD / CISA. “NVD-CWE-Other” and “NVD-CWE-noinfo” mean NVD could not assign a specific weakness.
Mitigation & advisories
Vendor advisory: https://www.mozilla.org/security/advisories/mfsa2026-89/
References
- https://bugzilla.mozilla.org/show_bug.cgi?id=1847631 security@mozilla.org
- https://www.mozilla.org/security/advisories/mfsa2026-89/ security@mozilla.org
Data sources
NVD CVE API 2.0 — fetched 2026-10-27 06:51 UTC · record ↗