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Apache Struts 2 Documentation
S2-006
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## Summary

Multiple Cross-Site Scripting (XSS) in XWork generated error pages

Who should read this | All Struts 2 developers
Impact of vulnerability | Injection of malicious client side code
Maximum security rating | Important
Recommendation | Developers should either upgrade to Struts 2.2.3 or apply the configuration changes described below
Affected Software | Struts 2.0.0 - Struts 2.2.1.1
Original JIRA Tickets | WW-3579
Reporter | Dr. Marian Ventuneac, Genworth
CVE Identifier | CVE-2011-1772

## Problem

By default, XWork doesn't escape action's names in automatically generated error page, allowing for a successful XSS attack. When Dynamic Method Invocation (DMI) is enabled, the action name is generated dynamically base on request parameters. This allows to call non-existing page and method to produce error page with injected code as below

http://localhost:8080/struts2-blank/home.action!login:cantLogin<script>alert(document.cookie)</script>=some_value

A more detailed description is found in the referenced JIRA ticket.

## Solution

As of Struts 2.2.3 the action names are escaped when automatically generated error pages are rendered.

When staying with earlier releases, developers should either

- Disable DMI support in struts.xml

or

- Define error page in struts.xml (as below)

You can obtain Struts 2.2.3 here.