CVE-2026-53900

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.

CVSS v3 4.3 MEDIUM

4.3^/10

CVSS v3 : MEDIUM

Vector :

Exploitability : 2.8 / Impact : 1.4

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction REQUIRED

Confidentiality Impact LOW

Integrity Impact NONE

Availability Impact NONE

Scope UNCHANGED

References

Link	Resource
https://bugzilla.mozilla.org/show_bug.cgi?id=2043204	Permissions Required
https://www.mozilla.org/security/advisories/mfsa2026-56/	Vendor Advisory

Configurations

Configuration 1 (hide)

cpe:2.3:a:mozilla:firefox_mobile:*:*:*:*:*:iphone_os:*:*

History

26 Oct 2026, 12:10

Type	Values Removed	Values Added
Summary		(es) Firefox para iOS conservaba las cookies establecidas en la solicitud inicial de PDF a través de redirecciones HTTP de origen cruzado en TemporaryDocument, lo que permitía a un sitio malicioso inyectar cookies arbitrarias en las solicitudes a un dominio objetivo no relacionado. Esta vulnerabilidad fue corregida en Firefox para iOS 152.0.

Information

Published : 2026-06-16 13:16

Updated : 2026-10-26 12:10

NVD link : CVE-2026-53900

Mitre link : CVE-2026-53900

CVE.ORG link : CVE-2026-53900

JSON object : View

Products Affected

mozilla

firefox_mobile

CWE

CWE-345

Insufficient Verification of Data Authenticity

CWE-384

Session Fixation

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