Some vulnerabilities have been reported in Horde Groupware and Horde Groupware Webmail Edition, which can be exploited by malicious people to conduct cross-site scripting attacks.

1) Input passed via the URL to admin/phpshell.php, admin/cmdshell.php, and admin/sqlshell.php is is not properly sanitised before being returned. This can be exploited to execute arbitrary HTML and script code in a user's browser session in context of an affected site.

2) Horde's HTML input sanitation mechanism does not properly filter certain "data:" URIs. This can be exploited to execute arbitrary HTML and script code in a user's browser session in context of an affected site.

This may only affect certain Gecko-based browsers (e.g. Mozilla Firefox).

The vulnerabilities are related to:
SA37709

The vulnerabilities are reported in Horde Groupware and Horde Groupware Webmail Edition 1.2.4. Prior versions may also be affected.

Solution
Update to version 1.2.5 or apply patch.
Further details available to Secunia VIM customers

Provided and/or discovered by
1) Juan Galiana Lara, Internet Security Auditors.
2) Reported by the vendor.

Changelog
Further details available to Secunia VIM customers

Original Advisory
Horde:
http://marc.info/?l=horde-announce&m=126100750018478&w=2
http://marc.info/?l=horde-announce&m=126101076422179&w=2
http://bugs.horde.org/ticket/8715

Internet Security Auditors:
http://archives.neohapsis.com/archives/fulldisclosure/2009-12/0388.html

Other references
Further details available to Secunia VIM customers

Deep Links
Links available to Secunia VIM customers