CVE-2007-4556
OpenSymphony XWork vulnerable to improper input validation
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.
Exploit likelihood
What each source reports
NVD Score used
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.
- Record
CVE-2007-4556- CVSS 2.0
- 6.8 Medium
AV:N/AC:M/Au:N/C:P/I:P/A:P - Updated
- 2026-11-02
CVE List No score
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.
- Record
CVE-2007-4556- Updated
- 2026-11-02
EUVDEUVD-2022-4099 No score
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.
- Record
EUVD-2022-4099- Updated
- 2026-11-03
GitHub AdvisoriesGHSA-h7mf-qrm9-2848 No score
OpenSymphony XWork vulnerable to improper input validation
XWork is an command-pattern framework that is used to power WebWork as well as other applications. 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.
Note: Version 2.0.4 marks the change from opensymphony:xwork to com.opensymphony:xwork.
- Record
GHSA-h7mf-qrm9-2848- Weakness
- CWE-20
- Updated
- 2026-11-02
OSVGHSA-h7mf-qrm9-2848 No score
OpenSymphony XWork vulnerable to improper input validation
XWork is an command-pattern framework that is used to power WebWork as well as other applications. 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.
Note: Version 2.0.4 marks the change from opensymphony:xwork to com.opensymphony:xwork.
- Record
GHSA-h7mf-qrm9-2848- Weakness
- CWE-20
- Updated
- 2026-11-02
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
opensymphony:xworkMaven |
before 1.2.3 | 1.2.3 |
opensymphony:xworkMaven |
2.0.0 to 2.0.3 | 2.0.4 |
opensymphony:xworkMaven |
before 1.2.3, plus listed versions 1.01.0.11.0.31.0.41.0.5 Show 6 moreShow less1.11.1.11.1.31.21.2.11.2.2 |
1.2.3 |
opensymphony:xworkMaven |
2.0.0 up to 2.0.4, plus listed versions 2.0.0-j42.0.12.0.1-j42.0.22.0.3 |
2.0.4 |
Public exploits
Links only. Every CVE stores no exploit code.
| Source | Link | Date |
|---|---|---|
| Nuclei | OpenSymphony XWork/Apache Struts2 - Remote Code Execution |
History
| Recorded | Changed | Sources |
|---|---|---|
| aliases | EUVD | |
| affected, aliases, cwes, exploits, facts, references, title | GitHub Advisories, Nuclei, OSV | |
| first indexed | CVE List, NVD |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2007-4556 is a medium vulnerability (CVSS 6.8) in Opensymphony Xwork, published August 28, 2007. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 25.7%, the 97th percentile. Fixed in opensymphony:xwork 1.2.3.
References
securityfocus.com/bid/25524
jira.opensymphony.com/browse/XW-544
issues.apache.org/struts/browse/WW-2030
vupen.com/english/advisories/2007/3041
forums.opensymphony.com/ann.jspa?annID=54
Show 10 moreShow less
secunia.com/advisories/26693
wiki.opensymphony.com/display/WW/1.2.3+Press+Release
osvdb.org/37072
struts.apache.org/2.x/docs/s2-001.html
nvd.nist.gov/vuln/detail/CVE-2007-4556
github.com/advisories/GHSA-h7mf-qrm9-2848