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    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.

    Published:Jun 16, 2026
    Last Modified:Jun 16, 2026
    EPS:Jun 16, 2026
    EPSS Score:
    CVSS Score:4.3

    Affected Products

    Vendor
    Mozilla
    Product
    Firefox For Ios

    Exploits

    No exploit reference

    Common Attack Pattern Enumeration and Classification (CAPEC)

    CAPEC-111 JSON Hijacking (aka JavaScript Hijacking)
    CAPEC-141 Cache Poisoning
    CAPEC-142 DNS Cache Poisoning
    CAPEC-148 Content Spoofing
    CAPEC-196 Session Credential Falsification through Forging
    CAPEC-21 Exploitation of Trusted Identifiers
    CAPEC-218 Spoofing of UDDI/ebXML Messages
    CAPEC-31 Accessing/Intercepting/Modifying HTTP Cookies
    CAPEC-384 Application API Message Manipulation via Man-in-the-Middle
    CAPEC-385 Transaction or Event Tampering via Application API Manipulation
    CAPEC-386 Application API Navigation Remapping
    CAPEC-387 Navigation Remapping To Propagate Malicious Content
    CAPEC-388 Application API Button Hijacking
    CAPEC-39 Manipulating Opaque Client-based Data Tokens
    CAPEC-59 Session Credential Falsification through Prediction
    CAPEC-60 Reusing Session IDs (aka Session Replay)
    CAPEC-61 Session Fixation
    CAPEC-665 Exploitation of Thunderbolt Protection Flaws
    CAPEC-701 Browser in the Middle (BiTM)

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    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High