Cross-site Scripting (XSS) The advisory has been revoked - it doesn't affect any version of package php-horde-text-filter (opens in a new tab)
Threat Intelligence
Snyk has a proof-of-concept or detailed explanation of how to exploit this vulnerability.
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
Do your applications use this vulnerable package?
In a few clicks we can analyze your entire application and see what components are vulnerable in your application, and suggest you quick fixes.
Test your applications- Snyk IDSNYK-UBUNTU1604-PHPHORDETEXTFILTER-1075556
- published17 Feb 2021
- disclosed14 Feb 2021
Introduced: 14 Feb 2021
CVE-2021-26929 (opens in a new tab)Amendment
The Ubuntu security team deemed this advisory irrelevant for Ubuntu:16.04.
NVD Description
Note: Versions mentioned in the description apply only to the upstream php-horde-text-filter package and not the php-horde-text-filter package as distributed by Ubuntu.
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://people.ubuntu.com/~ubuntu-security/cve/CVE-2021-26929
- https://lists.horde.org/archives/announce/2021/001298.html
- 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://www.alexbirnberg.com/horde-xss.html
- https://www.horde.org/apps/webmail
- https://lists.debian.org/debian-lts-announce/2021/02/msg00028.html
- https://www.exploit-db.com/exploits/49769