CVE-2021-26929

MEDIUM

Horde Groupware < 5.2.22 - XSS

Title source: rule

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.

Exploits (1)

exploitdb WORKING POC

by nu11secur1ty · pythonwebappsmultiple

https://www.exploit-db.com/exploits/49769

View Code ZIP pw:eip

References (7)

[Exploit, Third Party Advisory, VDB Entry] http://packetstormsecurity.com/files/162187/Webmail-Edition-5.2.22-XSS-Remote-Code-Execution.html

[Third Party Advisory] http://packetstormsecurity.com/files/162194/Horde-Groupware-Webmail-5.2.22-Cross-Site-Scripting.html

[Third Party Advisory] https://github.com/horde/webmail/releases

[Mailing List, Third Party Advisory] https://lists.debian.org/debian-lts-announce/2021/02/msg00028.html

[Mailing List, Vendor Advisory] https://lists.horde.org/archives/announce/2021/001298.html

[Exploit, Third Party Advisory] https://www.alexbirnberg.com/horde-xss.html

[Vendor Advisory] https://www.horde.org/apps/webmail

Scores

CVSS v3 6.1

EPSS 0.0159

EPSS Percentile 81.7%

Attack Vector NETWORK

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Details

CWE

CWE-79

Status published

Products (2)

debian/debian_linux 9.0

horde/groupware < 5.2.22

Published Feb 14, 2021

Tracked Since Feb 18, 2026