CVE-2021-26929

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    CVE-2021-26929

    Published: 14 Feb 2021Last Modified: 8 Jul 2026

    Summary:

    Details: An XSS issue was discovered in Horde Groupware Webmail Edition through 5.2.22 (where the Horde_Text_Filter library before 2.3.7 is used). The attacker can send a plain text e-mail message, with JavaScript encoded as a link or email that is mishandled by preProcess in Text2html.php, because bespoke use of \x00\x00\x00 and \x01\x01\x01 interferes with XSS defenses.

    References: http://packetstormsecurity.com/files/162194/Horde-Groupware-Webmail-5.2.22-Cross-Site-Scripting.html, https://github.com/horde/webmail/releases, https://lists.debian.org/debian-lts-announce/2021/02/msg00028.html, https://lists.horde.org/archives/announce/2021/001298.html, https://www.horde.org/apps/webmail, http://packetstormsecurity.com/files/162187/Webmail-Edition-5.2.22-XSS-Remote-Code-Execution.html, https://www.alexbirnberg.com/horde-xss.html

    Affected packages

    Package

    Name:

    Purl:

    Affected ranges

    Type: GIT

    Events:

    Introduced- 0
    Fixed -None

    Affected versions

    v5.2.22
    v5.2.21
    v5.2.20
    v5.2.19
    v5.2.18
    v5.2.16
    v5.2.14
    v5.2.13
    v5.2.12
    v5.2.11
    v5.2.10
    v5.2.9
    v5.2.8
    v5.2.7
    v5.2.6
    v5.2.5
    v5.2.4
    v5.2.3
    v5.2.2
    v5.2.1
    v5.2.0
    v5.2.0rc1

    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-2021-26929 | CVE-DB