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    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.

    Published:Aug 28, 2007
    Last Modified:Apr 23, 2026
    EPS:Aug 28, 2007
    EPSS Score:0.02109
    CVSS Score:6.8

    Affected Products

    Vendor
    Opensymphony
    Product
    Xwork

    Exploits

    No exploit reference

    Common Weakness Enumeration

    No CWE recorded yet

    Common Attack Pattern Enumeration and Classification (CAPEC)

    No CAPEC recorded yet

    References

    http://forums.opensymphony.com/ann.jspa?annID=54
    http://issues.apache.org/struts/browse/WW-2030
    http://jira.opensymphony.com/browse/XW-544
    http://jira.opensymphony.com/secure/ReleaseNote.jspa?projectId=10050&styleName=Html&version=21701
    http://jira.opensymphony.com/secure/ReleaseNote.jspa?projectId=10050&styleName=Html&version=21706
    http://osvdb.org/37072
    http://secunia.com/advisories/26681
    http://secunia.com/advisories/26693
    http://secunia.com/advisories/26694
    http://struts.apache.org/2.x/docs/s2-001.html
    http://wiki.opensymphony.com/display/WW/1.2.3+Press+Release
    http://www.securityfocus.com/bid/25524
    http://www.vupen.com/english/advisories/2007/3041
    http://www.vupen.com/english/advisories/2007/3042
    http://forums.opensymphony.com/ann.jspa?annID=54
    http://issues.apache.org/struts/browse/WW-2030
    http://jira.opensymphony.com/browse/XW-544
    http://jira.opensymphony.com/secure/ReleaseNote.jspa?projectId=10050&styleName=Html&version=21701
    http://jira.opensymphony.com/secure/ReleaseNote.jspa?projectId=10050&styleName=Html&version=21706
    http://osvdb.org/37072
    http://secunia.com/advisories/26681
    http://secunia.com/advisories/26693
    http://secunia.com/advisories/26694
    http://struts.apache.org/2.x/docs/s2-001.html
    http://wiki.opensymphony.com/display/WW/1.2.3+Press+Release
    http://www.securityfocus.com/bid/25524
    http://www.vupen.com/english/advisories/2007/3041
    http://www.vupen.com/english/advisories/2007/3042

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High