Apache Tiles 2.1 before 2.1.2, as used in Apache Struts and other products, evaluates Expression Language (EL) expressions twice in certain circumstances, which allows remote attackers to conduct cross-site scripting (XSS) attacks or obtain sensitive information via unspecified vectors, related to the (1) tiles:putAttribute and (2) tiles:insertTemplate JSP tags.

References

• https://nvd.nist.gov/vuln/detail/CVE-2009-1275
• http://svn.apache.org/viewvc/tiles/framework/trunk/src/site/apt/security/security-bulletin-1.apt?revision=741913