We have identified and fixed a cross-site scripting (XSS) vulnerability in the Confluence Activity Stream gadget. All versions from 3.1 to 3.4.6 are affected.
- cgisecurity.com: http://www.cgisecurity.com/articles/xss-faq.shtml
- The Web Application Security Consortium: http://projects.webappsec.org/Cross-Site+Scripting
This issue is reported in our security advisory on this page:
The page also includes detailed patch instructions.