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    CVE-2026-49979

    Appsmith is a platform to build admin panels, internal tools, and dashboards. Prior to 1.99, the POST /api/v1/admin/send-test-email endpoint accepts attacker-controlled smtpHost and smtpPort values and establishes a raw JavaMail TCP connection without any IP validation. This completely bypasses WebClientUtils.IP_CHECK_FILTER, which only applies to Spring WebClient HTTP requests. Additionally, the raw MailException.getMessage() is returned verbatim in the API error response, enabling error-based internal port scanning and service banner enumeration. This vulnerability is fixed in 1.99.

    Published:Jun 24, 2026
    Last Modified:Jun 26, 2026
    EPS:Jun 24, 2026
    EPSS Score:0.00265
    CVSS Score:5.1

    Affected Products

    Vendor
    Appsmith
    Product
    Appsmith

    Exploits

    https://github.com/appsmithorg/appsmith/security/advisories/GHSA-vvxf-f8q9-86gh

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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