CVE-2007-4556
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.
Key facts
- CVSS score
- 6.8 (v2.0)
- Severity
- MEDIUM
- CVSS vector
AV:N/AC:M/Au:N/C:P/I:P/A:P- EPSS score
- 25.7% (98th percentile)
- In CISA KEV
- No
- In EU EUVD
- Yes (EUVD-2022-4099)
- Published
- August 28, 2007
- NVD last modified
- June 16, 2026
- Status
- Modified
EU Vulnerability Database (EUVD)
This vulnerability is also tracked by ENISA as EUVD-2022-4099 in the EU Vulnerability Database. Last updated in EUVD on August 7, 2024.
View on the EU Vulnerability DatabaseAffected products
- opensymphony / xwork
References
- http://forums.opensymphony.com/ann.jspa?annID=54(Patch, Vendor Advisory)
- http://issues.apache.org/struts/browse/WW-2030(Third Party Advisory)
- http://jira.opensymphony.com/browse/XW-544(Vendor Advisory)
- http://jira.opensymphony.com/secure/ReleaseNote.jspa?projectId=10050&styleName=Html&version=21701(Vendor Advisory)
- http://jira.opensymphony.com/secure/ReleaseNote.jspa?projectId=10050&styleName=Html&version=21706(Vendor Advisory)
- http://osvdb.org/37072(Broken Link)
- http://secunia.com/advisories/26681(Third Party Advisory)
- http://secunia.com/advisories/26693(Third Party Advisory)
- http://secunia.com/advisories/26694(Third Party Advisory)
- http://struts.apache.org/2.x/docs/s2-001.html(Patch, Third Party Advisory)
- http://wiki.opensymphony.com/display/WW/1.2.3+Press+Release(Vendor Advisory)
- http://www.securityfocus.com/bid/25524(Third Party Advisory, VDB Entry)
- http://www.vupen.com/english/advisories/2007/3041(Third Party Advisory)
- http://www.vupen.com/english/advisories/2007/3042(Third Party Advisory)
Last updated September 17, 2026 · Source: NVD, CISA KEV, FIRST.org EPSS
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