CVE-2026-53899

Cross-origin cookies could be leaked when opening a PDF link

CVSS 6.5 MEDIUMEPSS 0.1%CWE-345

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.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N

Produtos afetados

Mozilla · Firefox for iOS

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Referências

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