CVE-2007-4556

mediumpriority · track · 36EPSS 0.257 · 98 %ileEUUS

grimoire priorityP1 · Urgent

Exploitable?

—

no known exploitation

Likely / severe?

25.7% (98th) EPSS

CVSS 6.8 · medium

Is it mine?

5 products

Check your exposure

Who says so?

3 sources

enisa_euvd · nvd · osv

EPSS · scored 2026-10-28

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.

cvss

Technical severity, 0–10. One row per scoring source.

6.8

010

base score 0–10 · higher = more severe · hover a vector to decode

v2.06.8mediumAV:N/AC:M/Au:N/C:P/I:P/A:Pprimary · NVD / NIST USexploitability 8.6 · impact 6.4

v2.06.5mediumAV:N/AC:M/Au:N/C:P/I:P/A:P/E:Fsecondary · CVSS-BT (t0sche)

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-20US

affected products (5)

Products and version ranges known to be affected.

n/a n/a≤ n/aenisa_euvdEU
opensymphony xwork< 1.2.3nvdUScpe:2.3:a:opensymphony:xwork:*:*:*:*:*:*:*:*
opensymphony xwork2.0.0 → 2.0.4nvdUScpe:2.3:a:opensymphony:xwork:*:*:*:*:*:*:*:*
Maven opensymphony:xwork< 1.2.3osvUSpkg:maven/opensymphony/xwork
Maven opensymphony:xwork2.0.0 → 2.0.4osvUSpkg:maven/opensymphony/xwork

advisories (1)

Vendor and ecosystem advisories describing this.

GHSA-h7mf-qrm9-2848OpenSymphony XWork vulnerable to improper input validation2022-05-01ghsa · osvUS
XWork is an command-pattern framework that is used to power WebWork as well as other applications. 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. Note: Version 2.0.4 marks the change from `opensymphony:xwork` to `com.opensymphony:xwork`.

also known as (2)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

enisa_euvd nvd osv NVD CVE.org MITRE

published 2007-08-28modified 2026-06-16

references (28)

External citations — patches, advisories, analysis.

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