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Fencer Vulns
medium 6.1

CVE-2016-4003 json

Cross-site Scripting in Apache Struts

published 2016-04-12 10 y ago modified 2026-06-17 4 mo ago also GHSA-m3x6-9v6h-4g28 , EUVD-2022-4483

cvss
6.1
version 3.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
11.6%
EPSS 11.6% chance of exploitation in 30 days, percentile 96%
public exploits
0
none known

Summary

Cross-site scripting (XSS) vulnerability in the URLDecoder function in JRE before 1.8, as used in Apache Struts 2.x before 2.3.28, when using a single byte page encoding, allows remote attackers to inject arbitrary web script or HTML via multi-byte characters in a url-encoded parameter.

Patch / fix

  • maven org.apache.struts:struts2-core 2.3.28

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2016-4003 updated cvss 4.3

struts2: cross-site scripting vulnerability in the URLDecoder function

  • Red Hat JBoss Fuse Service Works 6 struts2-core struts2-core
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

11.56% chance of exploitation in the next 30 days, higher than 96% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 3.0 6.1 CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
NVD 2.0 4.3 AV:N/AC:M/Au:N/C:N/I:P/A:N
GitHub 3.0 6.1 CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Affected packages

ecosystem package affected fixed in
maven org.apache.struts:struts2-core
>=2.0.0, <2.3.28
2.3.28

Classification

Weakness
  • CWE-79 Improper Neutralization of Input During Web Page Generation

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.