CVE-2026-86853

Summary

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 Software

Weaknesses

ADP Enrichment

CISA ADP Vulnrichment

• SSVC:
• Exploitation: none
  • Automatable: no
  • Technical Impact: partial

References

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

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