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    CVE-2026-21859

    Mailpit is an email testing tool and API for developers. Versions 1.28.0 and below have a Server-Side Request Forgery (SSRF) vulnerability in the /proxy endpoint, allowing attackers to make requests to internal network resources. The /proxy endpoint validates http:// and https:// schemes, but it does not block internal IP addresses, enabling attackers to access internal services and APIs. This vulnerability is limited to HTTP GET requests with minimal headers. The issue is fixed in version 1.28.1.

    Published:Jan 7, 2026
    Last Modified:Apr 18, 2026
    EPS:Jan 7, 2026
    EPSS Score:0.01018
    CVSS Score:5.8

    Affected Products

    Vendor
    Axllent
    Product
    Mailpit

    Exploits

    https://github.com/axllent/mailpit/security/advisories/GHSA-8v65-47jx-7mfrhttps://github.com/axllent/mailpit/security/advisories/GHSA-8v65-47jx-7mfr

    Common Attack Pattern Enumeration and Classification (CAPEC)

    CAPEC-664 Server Side Request Forgery

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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