{
    "id": "CVE-2021-26929",
    "published": "2021-02-14 04:15:12",
    "last_modified": "2026-06-17 03:44:01",
    "cvss_score": "6.1",
    "cvss_severity": "MEDIUM",
    "cvss_version": "3.1",
    "cvss_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N",
    "cwe": "CWE-79",
    "description": "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.",
    "epss_score": "0.04944",
    "epss_percentile": "0.91893",
    "kev": 0,
    "kev_due": null,
    "has_exploit": 1,
    "updated_at": "2026-10-02 18:17:29",
    "priority": {
        "rank": 2,
        "label": "Patch early",
        "why": "A public exploit exists."
    },
    "products": [
        {
            "vendor": "debian",
            "product": "debian_linux"
        },
        {
            "vendor": "horde",
            "product": "groupware"
        }
    ],
    "kev_detail": null,
    "exploits": [
        {
            "source": "exploit-db",
            "ref_id": "49769",
            "title": "Horde Groupware Webmail 5.2.22 - Stored XSS",
            "date": "2021-04-15",
            "url": "https://www.exploit-db.com/exploits/49769"
        }
    ],
    "refs_list": [
        "http://packetstormsecurity.com/files/162187/Webmail-Edition-5.2.22-XSS-Remote-Code-Execution.html",
        "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.alexbirnberg.com/horde-xss.html",
        "https://www.horde.org/apps/webmail",
        "http://packetstormsecurity.com/files/162187/Webmail-Edition-5.2.22-XSS-Remote-Code-Execution.html",
        "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.alexbirnberg.com/horde-xss.html",
        "https://www.horde.org/apps/webmail"
    ]
}