CVE

CVE-2007-4556

6.8

CVSS

Description

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.

Attack Vector

Privileges Req.

User Interaction

Updated Sep 18, 2026View on NVD →

S4E scanner

mediumProduct Based Web Vulnerabilities~15 seconds

CVE-2007-4556 Scanner

CVE-2007-4556 scanner - Code Execution vulnerability in Apache Software Foundation Struts

Used 2.1k times · 5.9k assets checked · url

Scanner page →Run scanner

Monitor this CVE on your assets

S4E maps published CVEs to scanners and forecasts the next disclosure window for your stack.

Create a free account →