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    CVE-2026-23845

    Mailpit is an email testing tool and API for developers. Versions prior to 1.28.3 are vulnerable to Server-Side Request Forgery (SSRF) via HTML Check CSS Download. The HTML Check feature (`/api/v1/message/{ID}/html-check`) is designed to analyze HTML emails for compatibility. During this process, the `inlineRemoteCSS()` function automatically downloads CSS files from external `<link rel="stylesheet" href="...">` tags to inline them for testing. Version 1.28.3 fixes the issue.

    Published:Jan 19, 2026
    Last Modified:Apr 18, 2026
    EPS:Jan 19, 2026
    EPSS Score:0.0006
    CVSS Score:5.8

    Affected Products

    Vendor
    Axllent
    Product
    Mailpit

    Exploits

    https://github.com/axllent/mailpit/security/advisories/GHSA-6jxm-fv7w-rw5j

    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