CVE-2026-53899

Summary

Firefox for iOS used partial domain matching when attaching cookies to PDF requests, allowing a malicious site on a suffix domain to receive cookies belonging to the target site. This vulnerability was fixed in Firefox for iOS 152.0.

Affected Software

Weaknesses

ADP Enrichment

CISA ADP Vulnrichment

• SSVC:
• Exploitation: none
  • Automatable: yes
  • Technical Impact: partial

References

• https://bugzilla.mozilla.org/show_bug.cgi?id=2042909
• https://www.mozilla.org/security/advisories/mfsa2026-56/

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