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CVE-2007-4556 OpenSymphony XWork

Affected softwareOpenSymphony XWork
Severity6.8 Medium CVSS 2.0
Fixed in1.2.3, 2.0.4
WeaknessImproper input validation (CWE-20)
Published28 Aug 2007
Updated16 Jun 2026

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.

Exploitation status

Working exploit published

A reviewed exploit catalogue lists ready-to-run exploit code for this CVE.

  • CISA KEV not listed
  • VulnCheck KEV not listed
  • CISA Vulnrichment no assessment published
  • Indexed PoC 1 indexed Published artifacts you can open, in Nuclei.
  • EPSS 26% chance in 30 days A model's forecast, not a report of exploitation. Higher than 98% of all scored CVEs.
IndexArtifactStarsFirst seen
Nuclei OpenSymphony XWork/Apache Struts2 - Remote Code Execution

Waratek protection

Mitigation candidate

A kind of vulnerability Waratek's rules address, with exploit code published or exploitation reported. No rule exists and none is planned yet. The decision below says what we found to build a rule from.

  • Protection none
  • Action unverified
  • Review automated Inferred
  • Record active
Decided by The affected package being open source on Maven, so the fix can be read
Finding This CVE affects an open-source Java library published on Maven Central (Maven packages: opensymphony:xwork), so it is squarely in ARMR's territory and the source needed to understand the defect is public. That makes it a candidate for an ARMR patch rule. No rule exists and none is scheduled: the diff between the affected and fixed versions has not been read, and a closer look may find no hook point ARMR can act on.

Affected software and releases

Maven packages

Affected and fixed versions, from OSV.dev
PackageIntroducedFixedLast affected
opensymphony:xwork 0 1.2.3 unbounded
opensymphony:xwork 2.0.0 2.0.4 unbounded

Products and versions

2 products, 4 version entries
SourceVendorProductSchemeAffected versions
nvd opensymphony xwork generic < 1.2.3 · ≥ 2.0.0 and ≤ 2.0.4
osv opensymphony xwork generic < 1.2.3 · ≥ 2.0.0 and < 2.0.4

References

URLTags
http://struts.apache.org/2.x/docs/s2-001.html WEB
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

Timeline

Published2007-08-28By the CVE Program.
NVD record modified2026-06-16NVD's own last-modified date for this record.