CVE-2021-26929 Information

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.

CVSS Vector

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

Reference

https://github.com/horde/webmail/releases https://lists.horde.org/archives/announce/2021/001298.html https://www.horde.org/apps/webmail https://www.alexbirnberg.com/horde-xss.html https://lists.debian.org/debian-lts-announce/2021/02/msg00028.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

Attack Complexity

LOW

Privileges Required

NONE

User Interaction Required

NONE

Scope

REQUIRED

Confidentiality Impact

CHANGED

Integrity Impact

LOW

Availability Impact

LOW

Base Score

NONE

Base Severity

6.1