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    CVE-2026-53899

    Firefox for iOS used partial domain matching when attaching cookies to PDF requests, allowing a malicious site on a suffix domain to receive cookies belonging to the target site. 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:6.5

    Affected Products

    Vendor
    Mozilla
    Product
    Firefox For Ios

    Exploits

    No exploit reference

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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