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Vulnerability record · CVE-2007-4556 · published 28 August 2007

CVE-2007-4556: Opensymphony xwork vulnerability

OOpensymphony · Xwork

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.

6.8 CVSS 2.0 Medium EPSS 26% · top 2.1%
6.8CVSS 2.0 base score
26%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
28References
16 Jun 2026Last modified by NVD

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.

AV:N/AC:M/Au:N/C:P/I:P/A:P

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
http://forums.opensymphony.com/ann.jspa?annID=54 PatchVendor 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 PatchThird Party Advisory
http://wiki.opensymphony.com/display/WW/1.2.3+Press+Release Vendor Advisory
http://www.securityfocus.com/bid/25524 Third Party AdvisoryVDB Entry
http://www.vupen.com/english/advisories/2007/3041 Third Party Advisory
http://www.vupen.com/english/advisories/2007/3042 Third Party Advisory
http://forums.opensymphony.com/ann.jspa?annID=54 PatchVendor 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 PatchThird Party Advisory
http://wiki.opensymphony.com/display/WW/1.2.3+Press+Release Vendor Advisory
http://www.securityfocus.com/bid/25524 Third Party AdvisoryVDB Entry
http://www.vupen.com/english/advisories/2007/3041 Third Party Advisory
http://www.vupen.com/english/advisories/2007/3042 Third Party Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

5.0CVE-2011-2088Apache struts information exposure vulnerabilityXWork 2.2.1 in Apache Struts 2.2.1, and OpenSymphony XWork in OpenSymphony WebWork, allows remote attackers to obtain potentially sensitive informati…EPSS 6.1%5.0CVE-2008-6504Opensymphony xwork improper input validation vulnerabilityParametersInterceptor in OpenSymphony XWork 2.0.x before 2.0.6 and 2.1.x before 2.1.2, as used in Apache Struts and other products, does not properly…EPSS 37%2.6CVE-2011-1772Apache struts cross-site scripting vulnerabilityMultiple cross-site scripting (XSS) vulnerabilities in XWork in Apache Struts 2.x before 2.2.3, and OpenSymphony XWork in OpenSymphony WebWork, allow…EPSS 33%

Source: NIST National Vulnerability Database (record CVE-2007-4556), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.