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    CVE-2026-93637

    An authentication rate-limit bypass in Zimbra Collaboration Suite 10.1.0 through 10.1.21 allows unauthenticated attackers to make repeated password guesses through GraphQL without incrementing Zimbra’s source-IP failure counter. GraphQL aliases allow multiple authentication attempts in one HTTP request.

    Published:Oct 14, 2026
    Last Modified:Oct 18, 2026
    EPS:Oct 14, 2026
    EPSS Score:0.00294
    CVSS Score:3.7

    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