How severe is CVE-2016-4003?

CVE-2016-4003 has a CVSS 3.x base score of 6.1, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.

Is CVE-2016-4003 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 12% (96th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2016-4003?

CVE-2016-4003 affects Apache Struts. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2016-4003?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2016-4003 published?

CVE-2016-4003 was published on 2016-04-12 and last updated on 2026-06-17.

CVE-2016-4003

CVE-2016-4003 is a medium-severity vulnerability in Apache Struts with a CVSS 3.x base score of 6.1. Its EPSS exploit-prediction score of 12% places it in the 96th percentile, indicating an elevated likelihood of exploitation. The underlying weakness is classified as CWE-79.

Key facts

Severity: Medium (CVSS 3.x base score 6.1)
CVSS v2: 4.3
EPSS exploit prediction: 12% (96th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-79
Affected product: Apache Struts
Published: 2016-04-12
Last modified: 2026-06-17

Description

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.

Frequently asked questions

What is CVE-2016-4003?: 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.
How severe is CVE-2016-4003?: CVE-2016-4003 has a CVSS 3.x base score of 6.1, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.
Is CVE-2016-4003 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 12% (96th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2016-4003?: CVE-2016-4003 affects Apache Struts. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2016-4003?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2016-4003 published?: CVE-2016-4003 was published on 2016-04-12 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:apache:struts:*:*:*:*:*:*:*:*

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