Medium severity6.1NVD Advisory· Published Feb 14, 2021· Updated Jun 17, 2026
CVE-2021-26929
CVE-2021-26929
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.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected products
4- Range: <=5.2.22
- Range: <2.3.7
Patches
Vulnerability mechanics
References
7- packetstormsecurity.com/files/162187/Webmail-Edition-5.2.22-XSS-Remote-Code-Execution.htmlnvdExploitThird Party AdvisoryVDB Entry
- www.alexbirnberg.com/horde-xss.htmlnvdExploitThird Party Advisory
- packetstormsecurity.com/files/162194/Horde-Groupware-Webmail-5.2.22-Cross-Site-Scripting.htmlnvdThird Party Advisory
- github.com/horde/webmail/releasesnvdThird Party Advisory
- lists.debian.org/debian-lts-announce/2021/02/msg00028.htmlnvdMailing ListThird Party Advisory
- lists.horde.org/archives/announce/2021/001298.htmlnvdMailing ListVendor Advisory
- www.horde.org/apps/webmailnvdVendor Advisory
News mentions
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