How severe is CVE-2016-6347?

CVE-2016-6347 has a CVSS score of 6.1/10, rated MEDIUM. Review your exposure and patch according to your risk tolerance.

Which packages are affected by CVE-2016-6347?

CVE-2016-6347 affects the following packages: org.jboss.resteasy:resteasy-client (Maven), org.jboss.resteasy:resteasy-client (Maven). Ecosystems affected: Maven.

How do I fix CVE-2016-6347?

Update org.jboss.resteasy:resteasy-client to 3.0.20.Final or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2016-6347 is resolved across your whole dependency graph.

How do I detect CVE-2016-6347 in my Maven dependencies?

Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for org.jboss.resteasy:resteasy-client, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

How do I mitigate CVE-2016-6347 if there is no patch (or I can't update yet)?

Escape or sanitise the affected output on the server side rather than relying on client-side filtering, and add a Content-Security-Policy that blocks inline script execution so injected markup cannot run even if it reaches the page.

Is CVE-2016-6347 actively exploited in the wild?

No public exploit code has been indexed for CVE-2016-6347 yet. This does not mean the vulnerability cannot be exploited — absence of public exploits does not imply safety. Apply the recommended fix and use O3 Security to monitor your exposure.

What is the EPSS score for CVE-2016-6347?

CVE-2016-6347 has an EPSS (Exploit Prediction Scoring System) score of 1.9%, placing it in the 79th percentile of all CVEs. EPSS is maintained by FIRST.org and estimates the probability that a vulnerability will be exploited in the wild within the next 30 days. This score indicates relatively lower exploitation probability, though the CVSS severity should still guide your patching priority.

What type of vulnerability is CVE-2016-6347?

CVE-2016-6347 is classified as Cross-site Scripting (XSS) (CWE-79). This weakness type describe the underlying flaw category, which helps determine the potential impact and the right class of mitigation. This is a high-impact weakness class that often enables remote code execution or data exposure.

When was CVE-2016-6347 published, and has it been updated?

CVE-2016-6347 was published on April 20, 2017 and was last updated on March 14, 2026. Advisory data evolves as severity scores, affected ranges, and exploit intelligence are revised — always check the latest version of the advisory before acting.

☕

☕ Maven

Not in CISA KEV

MEDIUM severity

CVE-2016-6347 — resteasy-client

MEDIUM

CVE-2016-6347 is a medium-severity (CVSS 6.1) Cross-site Scripting (XSS) vulnerability in org.jboss.resteasy:resteasy-client. A fix is available for org.jboss.resteasy:resteasy-client — see the affected versions and patch details below.

Improper Neutralization of Input During Web Page Generation in RESTEasy

Also known asGHSA-r346-rmrg-qpgh

Published

Apr 20, 2017

Updated

Mar 14, 2026

Affected

2 pkgs

Patched

2 / 2

Exploits

None indexed

Exploitation data as of Nov 3, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗

1.9%probability of exploitation in next 30 days

Lower Risk0.00%

Lower risk than most CVEs79th percentile — riskier than 79% of all scored CVEsHighest risk

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

Where this sits among everything scored

Real-World Exposure

2 pkgs affected

☕org.jboss.resteasy:resteasy-client☕org.jboss.resteasy:resteasy-client

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects Maven packages — download data is not available via public APIs for these ecosystems.

Description

Cross-site scripting (XSS) vulnerability in the default exception handler in RESTEasy allows remote attackers to inject arbitrary web script or HTML via unspecified vectors.

Affected Packages

2 total 2 fixed

Ecosystem	Package	Vulnerable range	Fix
☕Maven	`org.jboss.resteasy:resteasy-client`	all versions	3.0.20.Final`org.jboss.resteasy:resteasy-client:3.0.20.Final`
☕Maven	`org.jboss.resteasy:resteasy-client`	≥ 3.1.0.Beta1&&< 3.1.0.CR1	3.1.0.CR1`org.jboss.resteasy:resteasy-client:3.1.0.CR1`

Affected Products

1 product · 1 configurations

Application

resteasyredhat

all

Detection & mitigation playbook

Open-source dependency

Detect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for org.jboss.resteasy:resteasy-client, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update org.jboss.resteasy:resteasy-client to 3.0.20.Final or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2016-6347 is resolved across your whole dependency graph.
Workarounds
Escape or sanitise the affected output on the server side rather than relying on client-side filtering, and add a Content-Security-Policy that blocks inline script execution so injected markup cannot run even if it reaches the page.

Frequently Asked Questions

Cross-site scripting (XSS) vulnerability in the default exception handler in RESTEasy allows remote attackers to inject arbitrary web script or HTML via unspecified vectors.

O3 Security · Impact-Aware SCA

Is CVE-2016-6347 in your dependencies?

Find it across Maven, including transitive dependencies.

Scan my dependencies How O3 SCA works

CVSS Score

6.1/10CVSS v3 base

Vector breakdown

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

Required

Scope

Changed

Confidentiality

Low

Integrity

Low

Availability

None

Raw vector

CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

CWE Classification

CWE-79Cross-site Scripting (XSS)

Weaponization

No Nuclei template, Metasploit module or public proof-of-concept found.

Timeline

Disclosed

Apr 20, 2017

Last updated

Mar 14, 2026

Identifiers

CVE-2016-6347

GHSA-r346-rmrg-qpgh

References

Advisorysecurityfocus.com Advisorynvd.nist.gov · CVE 2016 6347 Reportbugzilla.redhat.com · show bug.cgi

Related vulnerabilities

Also affects resteasy-client

This CVE is medium severity; 6 of 6 other CVEs affecting resteasy-client are rated as high or higher (top: high).

CVE-2020-1695CVE-2016-6348CVE-2016-6345CVE-2012-0818CVE-2014-3490CVE-2020-25633

Same weakness: CWE-79

This CVE is medium severity; 2 of 2 other CVEs with CWE-79 are rated as high or higher (top: critical).

CVE-2026-113787CVE-2026-44267Browse all CWE-79

Provenance

Sources

OSV.devNVDFIRST.org (EPSS)

Last verifiedMar 14, 2026