Cross-site scripting in Groupware Webmail Edition and Horde_Text_Filter - CVE-2021-26929
Published: February 17, 2021 / Updated: June 17, 2021
Vulnerability identifier: #VU50773
CSH Severity: Low
CVSS v4: 5.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N]
CVE-ID: CVE-2021-26929
CWE-ID: CWE-79
Exploitation vector: Remote access
Exploit availability:
Public exploit is available
Vulnerability details
The disclosed vulnerability allows a remote attacker to perform cross-site scripting (XSS) attacks.
The vulnerability exists due to insufficient sanitization of user-supplied data in the "preProcess" in Text2html.php. A remote attacker can trick the victim to follow a specially crafted link and execute arbitrary HTML and script code in user's browser in context of vulnerable website.
Successful exploitation of this vulnerability may allow a remote attacker to steal potentially sensitive information, change appearance of the web page, perform phishing and drive-by-download attacks.
Affected software
Groupware Webmail Edition
Horde_Text_Filter
Fedora
php-horde-Horde-Text-Filter
Horde_Text_Filter
Fedora
php-horde-Horde-Text-Filter
How to mitigate CVE-2021-26929
Install updates from vendor's website.
Horde_Text_Filter - update to 2.3.7
php-horde-Horde-Text-Filter - addressed in versions 2.3.7-1.el7, 2.3.7-1.fc32, 2.3.7-1.fc33
php-horde-Horde-Text-Filter - addressed in versions 2.3.7-1.el7, 2.3.7-1.fc32, 2.3.7-1.fc33