Vulnerability Report

CVE-2026-53900

Title: Cross-Origin Cookie Injection in Firefox for iOS

Other

Proof Of Concept

No public PoC currently indexed for CVE-2026-53900.

CWE Category NVD-CWE-noinfo

Published Date Jun 16, 2026

Modified Date Jun 17, 2026

Exploit Status Not Found

Score 4.3 CVSS v

Exploit Probability (EPSS)

0.10%

Vulnerability Summary

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.

Impacted Vendors

mozilla 1

Reference Links

https://bugzilla.mozilla.org/show_bug.cgi?id=2043204 https://www.mozilla.org/security/advisories/mfsa2026-56/

CVSS v3.1

Source Entity 134c704f-9b21-4f2e-91b3-4a467353bcc0

Severity MEDIUM

4.3

Attack Vector

NETWORK

Complexity

LOW

Privileges

N/A

Interaction

REQUIRED

Confidentiality

N/A

Integrity

N/A

Availability

N/A

Scope

UNCHANGED

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

Associated Attack Patterns (CAPEC)

Total: Patterns

CVE-2026-53900 Exploits & PoCs (Proof Of Concept)

No public PoCs found in our database for this CVE.

June 17, 2026 MODIFIED

Vulnerability data updated via NVD.

June 16, 2026 MODIFIED

Vulnerability data updated via NVD.

June 16, 2026 MODIFIED

Vulnerability data updated via NVD.

June 16, 2026 MODIFIED

Vulnerability data updated via NVD.

Attack Vector Matrix

Access Vector NETWORK

Complexity LOW

Privileges N/A

Interaction REQUIRED

CVSS Vector String


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

Affected Stack

No specific products linked.