Description
Cross-site scripting (XSS) vulnerability in (1) Text_Filter/Filter/xss.php in Horde 3.1.x before 3.1.9 and 3.2.x before 3.2.2 and (2) externalinput.php in Popoon r22196 and earlier allows remote attackers to inject arbitrary web script or HTML by using / (slash) characters as replacements for spaces in an HTML e-mail message.
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 5.0 | horde3 | 3.2.1+debian0-2+lenny1 | DTSA-165-1 |
| Debian 4.0 | horde3 | 3.1.3-4etch4 | DSA-1642-1 |
Public exploits
Exploit or proof-of-concept code for this vulnerability is publicly available, which lowers the bar for attackers. Treat it as a reason to patch sooner.
Exploit-DB 1
- Horde Application Framework 3.2.1 - Forward Slash Insufficient Filtering Cross-Site Scripting EDB-32353 · webapps · Sep 10, 2008 · verified
Sources: PoC-in-GitHub, Metasploit Framework, Exploit-DB — updated daily. Only links are listed; no exploit code is hosted here.
Advisories 2
- DSA-1642-1 horde3 - cross site scripting Debian Security (DSA / DLA) · Mar 9, 2026
- DTSA-165-1 horde3 - several vulnerabilities Debian Security (DSA / DLA) · Mar 9, 2026
References
- [horde-announce] 20080910 Horde 3.1.9 (final) mailing-list
- 31842 third-party-advisory
- http://www.phpmyfaq.de/advisory_2008-09-11.php
- ADV-2008-2548 vdb-entry
- [horde-announce] 20080910 [SECURITY] Horde 3.2.2 (final) mailing-list
- http://ocert.org/patches/2008-012/Text_Filter.patch
- 20080910 [oCERT-2008-012] Horde, Popoon frameworks common input sanitization errors (XSS) mailing-list
- 4245 third-party-advisory
- [oss-security] 20080910 [oCERT-2008-012] Horde, Popoon frameworks common input sanitization errors (XSS) mailing-list
- http://www.ocert.org/advisories/ocert-2008-012.html
- http://ocert.org/patches/2008-012/Text_Filter.31.patch
- http://blog.liip.ch/missed-case-in-externalinput-php-resulting-in-viable-xss-attacks.html
- horde-htmlmessages-xss(45031) vdb-entry
- 47996 vdb-entry
- 31107 vdb-entry