PT-2026-49700 · Mozilla · Firefox For Ios

Muneaki Nishimura · Published 2026-06-16 · Updated 2026-06-16 · CVE-2026-53899

Mitre

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.

Related Identifiers

CVE-2026-53899

Affected Products

Firefox For Ios

References · 3

• https://mozilla.org/security/advisories/mfsa2026-56 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-53899 · Security Note
• https://bugzilla.mozilla.org/show_bug.cgi?id=2042909 · Note