ubuntu-cve-2021-26929
Vulnerability from osv_ubuntu
Published
2021-02-14 04:15
Modified
2025-10-24 04:50
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.

Severity
6.1 (Medium)
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
N/A (UNKNOWN)
medium
References
To clipboard 

{
  "affected": [
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "php-horde-text-filter",
            "binary_version": "2.3.3-1ubuntu1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:16.04:LTS",
        "name": "php-horde-text-filter",
        "purl": "pkg:deb/ubuntu/php-horde-text-filter@2.3.3-1ubuntu1?arch=source\u0026distro=xenial"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2.3.2-1",
        "2.3.2-2",
        "2.3.3-1",
        "2.3.3-1ubuntu1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "php-horde-text-filter",
            "binary_version": "2.3.5-1ubuntu1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:18.04:LTS",
        "name": "php-horde-text-filter",
        "purl": "pkg:deb/ubuntu/php-horde-text-filter@2.3.5-1ubuntu1?arch=source\u0026distro=bionic"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2.3.5-1",
        "2.3.5-1ubuntu1"
      ]
    }
  ],
  "aliases": [],
  "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.",
  "id": "UBUNTU-CVE-2021-26929",
  "modified": "2025-10-24T04:50:10Z",
  "published": "2021-02-14T04:15:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2021-26929"
    },
    {
      "type": "REPORT",
      "url": "https://lists.horde.org/archives/announce/2021/001298.html"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/horde/Text_Filter/commit/c26f938854c36b981558a3b1b9b2f81403cff60e"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/horde/Text_Filter/commit/a2f67da064d7a91440b7a2448e56a6387ab94c67"
    },
    {
      "type": "REPORT",
      "url": "https://www.alexbirnberg.com/horde-xss.html"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/horde/webmail/releases"
    },
    {
      "type": "REPORT",
      "url": "https://www.horde.org/apps/webmail"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2021-26929"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N",
      "type": "CVSS_V3"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2021-26929"
  ]
}



Log in or create an account to share your comment.




Tags
Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.