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    CVE-2026-18691

    An issue in MongoDB Server's intra-cluster connection setup could allow a party with suitable network access to influence which authentication mechanism is used when one replica set member connects to another. Under certain conditions, this could cause the cluster's shared internal credential to be transmitted in a less-protected form, potentially allowing that credential to be recovered. If recovered, the credential could be used to authenticate as the internal superuser to nodes in the deployment.

    Published:Aug 11, 2026
    Last Modified:Sep 16, 2026
    EPS:Aug 11, 2026
    EPSS Score:0.00238
    CVSS Score:8.8

    Affected Products

    Vendor
    Mongodb
    Product
    Mongodb
    Vendor
    Mongodb
    Product
    Mongodb Server

    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