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    CVE-2026-40873

    mailcow: dockerized is an open source groupware/email suite based on docker. In versions prior to 2026-03b, the Quarantine details modal injects attachment filenames into HTML without escaping, allowing arbitrary HTML/JS execution. An attacker can deliver an email with a crafted attachment name so that when an admin views the quarantine item, JavaScript executes in their browser, taking over their account. Version 2026-03b fixes the vulnerability.

    Published:Apr 21, 2026
    Last Modified:Apr 22, 2026
    EPS:Apr 21, 2026
    EPSS Score:0.00078
    CVSS Score:8.9

    Affected Products

    Vendor
    Mailcow
    Product
    Mailcow Dockerized

    Exploits

    No exploit reference

    Related CVEs

    CVE-2026-7460 (CVSS 7.4) — mailcow-dockerized contains a stored cross-site scripting vulnerability in the administrator Queue Manager. Th…
    CVE-2026-40878 (CVSS 2.1) — mailcow: dockerized is an open source groupware/email suite based on docker. In versions prior to 2026-03b, th…
    CVE-2026-40875 (CVSS 7) — mailcow: dockerized is an open source groupware/email suite based on docker. In versions prior to 2026-03b, th…
    CVE-2026-40874 (CVSS 6) — mailcow: dockerized is an open source groupware/email suite based on docker. In versions prior to 2026-03b, no…
    CVE-2026-40872 (CVSS 9.3) — mailcow: dockerized is an open source groupware/email suite based on docker. In versions prior to 2026-03b, th…
    CVE-2026-40871 (CVSS 7.2) — mailcow: dockerized is an open source groupware/email suite based on docker. Versions prior to 2026-03b have a…
    CVE-2025-53909 (CVSS 9.1) — mailcow: dockerized is an open source groupware/email suite based on docker. A Server-Side Template Injection …
    CVE-2025-25198 (CVSS 7.1) — mailcow: dockerized is an open source groupware/email suite based on docker. Prior to version 2025-01a, a vuln…
    CVE-2024-31204 (CVSS 6.1) — mailcow: dockerized is an open source groupware/email suite based on docker. A security vulnerability has been…
    CVE-2024-30270 (CVSS 6.2) — mailcow: dockerized is an open source groupware/email suite based on docker. A security vulnerability has been…

    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