CVE-2026-53899

Description

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.

PUBLISHED Reserved 2026-06-11 | Published 2026-06-16 | Updated 2026-06-16 | Assigner mozilla

Product status

Credits

Muneaki Nishimura

References

bugzilla.mozilla.org/show_bug.cgi?id=2042909

www.mozilla.org/security/advisories/mfsa2026-56/

cve.org (CVE-2026-53899)

nvd.nist.gov (CVE-2026-53899)

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