CVE-2026-53900
Received Received - Intake
Firefox for iOS Cookie Injection via Cross-Origin PDF Redirect

Publication date: 2026-06-16

Last updated on: 2026-06-16

Assigner: Mozilla Corporation

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.
CVSS Scores
EPSS Scores
Probability:
Percentile:
Meta Information
Published
2026-06-16
Last Modified
2026-06-16
Generated
2026-06-16
AI Q&A
2026-06-16
EPSS Evaluated
N/A
NVD
CVE-2026-53900
EUVD
EUVD-2026-37078
Affected Vendors & Products
Showing 1 associated CPE
Vendor Product Version / Range
mozilla firefox_for_ios 152.0
Helpful Resources
Exploitability
CWE
CWE Icon
KEV
KEV Icon
CWE ID Description
CWE-UNKNOWN
Attack-Flow Graph
AI Quick Actions
Instant insights powered by AI
Executive Summary

This vulnerability in Firefox for iOS involved the browser preserving cookies set on the initial PDF request across cross-origin HTTP redirects within TemporaryDocument. This behavior allowed a malicious website to inject arbitrary cookies into requests sent to an unrelated target domain.

The issue was fixed in Firefox for iOS version 152.0.

Impact Analysis

An attacker could exploit this vulnerability to inject arbitrary cookies into requests to unrelated domains. This could lead to unauthorized actions or access if the injected cookies are used for authentication or session management by the target domain.

Mitigation Strategies

To mitigate this vulnerability, update Firefox for iOS to version 152.0 or later, where the issue has been fixed.

Chat Assistant
Ask questions about this CVE
Hi! I’m here to help you understand CVE-2026-53900. Ask me anything about the vulnerability, its impact, or mitigation strategies.
0/70
EPSS Chart