CVE-2026-121551

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    CVE-2026-121551

    Published: 3 Nov 2026Last Modified: 5 Nov 2026

    Summary: PostfixAdmin through 4.0.5 Stored XSS via TOTP Exception Description

    Details: PostfixAdmin through 4.0.5 contains a stored cross-site scripting vulnerability that allows authenticated mailbox users to inject script by creating a TOTP exception with an unescaped description. When a global administrator views totp-exceptions.php, the script runs in the admin session and can issue authenticated admin requests using the page's CSRF token.

    References: https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/121xxx/CVE-2026-121551.json, https://nvd.nist.gov/vuln/detail/CVE-2026-121551, https://www.vulncheck.com/advisories/postfixadmin-through-4.0.5-stored-xss-via-totp-exception-description, https://github.com/postfixadmin/postfixadmin/issues/1185, https://github.com/postfixadmin/postfixadmin/commit/0a894b08769481ce1a7f0f42af901c6d9f88fa9c, https://github.com/postfixadmin/postfixadmin/pull/1172, https://github.com/postfixadmin/postfixadmin/pull/1186, https://github.com/postfixadmin/postfixadmin, https://github.com/postfixadmin/postfixadmin/blob/v4.0.5/public/users/totp-exceptions.php#L128, https://github.com/postfixadmin/postfixadmin/blob/v4.0.5/templates/totp-exceptions.tpl#L56

    Affected packages

    Package

    Name:

    Purl:

    Affected ranges

    Type: GIT

    Events:

    Introduced- 0
    Fixed -0a894b08769481ce1a7f0f42af901c6d9f88fa9c

    Affected versions

    v4.0.5
    v4.0.4
    v4.0.3
    v4.0.2
    v4.0.1
    v4.0.0

    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
    CVE-2026-121551 | CVE-DB