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    CVE-2026-93647

    An unauthenticated calendar sender can place active markup in a COUNTER message's RFC From address. Selecting the message in Zimbra Classic triggers stored XSS, allowing the attacker to access mailbox data and act as the victim.

    Published:Sep 25, 2026
    Last Modified:Sep 28, 2026
    EPS:Sep 25, 2026
    EPSS Score:0.00229
    CVSS Score:9.3

    Affected Products

    Vendor
    Zimbra
    Product
    Zimbra Collaboration Suite

    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