Struts support in OpenSymphony XWork before 1.2.3, and 2.x before 2.0.4, as used in WebWork and Apache Struts, recursively evaluates all input as an Object-Graph Navigation Language (OGNL) expression when altSyntax is enabled, which allows remote attackers to cause a denial of service (infinite loop) or execute arbitrary code via form input beginning with a %{ sequence and ending with a } character.
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Xwork | Opensymphony | * | 1.2.3 (excluding) |
| Xwork | Opensymphony | 2.0.0 (including) | 2.0.4 (including) |