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    CVE-2026-21393

    Movable Type contains a stored cross-site scripting vulnerability in Edit Comment. If crafted input is stored by an attacker, arbitrary script may be executed on a logged-in user's web browser. Note that Movable Type 7 series and 8.4 series, which are End-of-Life (EOL), are affected by the vulnerability as well.

    Published:Feb 4, 2026
    Last Modified:Apr 18, 2026
    EPS:Feb 4, 2026
    EPSS Score:0.00014
    CVSS Score:5.4

    Affected Products

    Vendor
    Six Apart
    Product
    Movable Type
    Vendor
    Six Apart Ltd
    Product
    Movable Type

    Exploits

    No exploit reference

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    CVE-2026-22875 (CVSS 4.8) — Movable Type contains a stored cross-site scripting vulnerability in Export Sites. If crafted input is stored …
    CVE-2025-62499 (CVSS 4.6) — Movable Type contains a stored cross-site scripting vulnerability in Edit CategorySet of ContentType page. If …
    CVE-2025-54856 (CVSS 4.6) — Movable Type contains a stored cross-site scripting vulnerability in Edit ContentData page. If crafted input i…
    CVE-2012-2644 (CVSS 4.3) — Cross-site scripting (XSS) vulnerability in the MT4i plugin 3.1 beta 4 and earlier for Movable Type allows rem…
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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