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CVE-2007-4556

39
FAUCET Score

CVE-2007-4556 describes a critical vulnerability in OpenSymphony XWork (versions before 1.2.3 and 2.x before 2.0.4), also used in WebWork and Apache Struts, where enabling altSyntax allows remote attackers to execute arbitrary code or cause a denial of service. This is due to the recursive evaluation of form input as an OGNL expression, triggered by specific input sequences. With a CVSS score of 6.8 (medium severity), it has a high FAUCET Risk Score of 86/100, indicating a significant threat with network-based attacks and medium complexity. While there's no evidence of active exploitation in the wild or Metasploit modules, Nuclei templates exist for Remote Code Execution, and there is minimal community discussion or media coverage.

Impacted Technologies

VendorProductVersion(s)CPE
< 1.2.3CPE matchmatch criteria
cpe:2.3:a:opensymphony:xwork:*:*:*:*:*:*:*:*
>= 2.0.0, <= 2.0.4CPE matchmatch criteria
cpe:2.3:a:opensymphony:xwork:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 2.0

6.8MEDIUM

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

Confidentiality Impact
PARTIAL
Integrity Impact
PARTIAL
Availability Impact
PARTIAL
Access Vector
NETWORK
Access Complexity
MEDIUM
Authentication
NONE
Exploitability Score
8.6
Impact Score
6.4
CvssVersion
2.0

Exploit Intelligence

EPSS Score
25.75%
Probability of exploitation in next 30 days
EPSS Percentile
97.8%
Percentile rank of EPSS score among Peer Group
As of 2026-07-25
Model: v2026.06.15
Nuclei: CVE-2007-4556 · Feb 21, 2021
This CVE's current EPSS score of 0.2575 is in the 98th percentile among its peer group of 19,955 CVEs.

Social Chatter

No social media mentions found for this CVE.

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.0 Bluesky, 0.0 Mastodon, and 0.2 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.0 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (2)

mavenpatch availablevia ghsa
Product: opensymphony:xworkFixed in: 1.2.3
mavenpatch availablevia ghsa
Product: opensymphony:xworkFixed in: 2.0.4

Vendor Advisories (1)

mavenGHSA-h7mf-qrm9-2848medium

OpenSymphony XWork vulnerable to improper input validation

May 1, 2022

References

forums.opensymphony.com / ann.jspa
PatchVendor Advisory
issues.apache.org / struts/browse/WW-2030
Third Party Advisory
jira.opensymphony.com / browse/XW-544
Vendor Advisory
jira.opensymphony.com / secure/ReleaseNote.jspa
Vendor Advisory
jira.opensymphony.com / secure/ReleaseNote.jspa
Vendor Advisory
osvdb.org / 37072
Broken Link
secunia.com / advisories/26681
Third Party Advisory
secunia.com / advisories/26693
Third Party Advisory
secunia.com / advisories/26694
Third Party Advisory
struts.apache.org / 2.x/docs/s2-001.html
PatchThird Party Advisory
wiki.opensymphony.com / display/WW/1.2.3+Press+Release
Vendor Advisory
securityfocus.com / bid/25524
Third Party AdvisoryVDB Entry
vupen.com / english/advisories/2007/3041
Third Party Advisory
vupen.com / english/advisories/2007/3042
Third Party Advisory