CVE-2026-53900

Description

Firefox for iOS preserved cookies set on the initial PDF request across cross-origin HTTP redirects in TemporaryDocument, allowing a malicious site to inject arbitrary cookies into requests to an unrelated target domain. 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=2043204

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

cve.org (CVE-2026-53900)

nvd.nist.gov (CVE-2026-53900)

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