How severe is CVE-2019-0186?

CVE-2019-0186 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-2019-0186?

CVE-2019-0186 affects the following packages: org.apache.portals.pluto:chatRoomDemo (Maven). Ecosystems affected: Maven.

How do I fix CVE-2019-0186?

Update org.apache.portals.pluto:chatRoomDemo to 3.1.0 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2019-0186 is resolved across your whole dependency graph.

How do I detect CVE-2019-0186 in my Maven dependencies?

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

How do I mitigate CVE-2019-0186 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-2019-0186 actively exploited in the wild?

Yes. There are 3 known exploit references for CVE-2019-0186, including 1 documented proof-of-concept exploit on Exploit-DB and 2 in-the-wild exploitations observed on GitHub and other sources. Treat this as actively exploitable and prioritize patching immediately. All exploit code should only be run in an isolated sandbox environment for research or authorized testing — never against production systems without explicit written authorization.

What is the EPSS score for CVE-2019-0186?

CVE-2019-0186 has an EPSS (Exploit Prediction Scoring System) score of 20.6%, placing it in the 98th 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 warrants monitoring and prompt remediation.

What type of vulnerability is CVE-2019-0186?

CVE-2019-0186 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-2019-0186 published, and has it been updated?

CVE-2019-0186 was published on May 24, 2022 and was last updated on February 18, 2024. 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-2019-0186 — chatRoomDemo

MEDIUM

CVE-2019-0186 is a medium-severity (CVSS 6.1) Cross-site Scripting (XSS) vulnerability in org.apache.portals.pluto:chatRoomDemo. 3 public exploit or proof-of-concept references are indexed, so weaponization risk is real. A fix is available for org.apache.portals.pluto:chatRoomDemo — see the affected versions and patch details below.

Cross-site Scripting in Apache Pluto Chatroom demo

Published

May 24, 2022

Updated

Feb 18, 2024

Affected

1 pkg

Patched

1 / 1

Exploits

3 known

Exploitation data as of Nov 2, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗

20.6%probability of exploitation in next 30 days

Moderate Risk0.00%

Lower risk than most CVEs98th percentile — riskier than 98% 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

1 pkg affected

☕org.apache.portals.pluto:chatRoomDemo

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

The input fields of the Apache Pluto "Chat Room" demo portlet 3.0.0 and 3.0.1 are vulnerable to Cross-Site Scripting (XSS) attacks. Mitigation: * Uninstall the ChatRoomDemo war file - or - * migrate to version 3.1.0 of the chat-room-demo war file

Affected Packages

1 total 1 fixed

Ecosystem	Package	Vulnerable range	Fix
☕Maven	`org.apache.portals.pluto:chatRoomDemo`	≥ 3.0.0&&< 3.1.0	3.1.0`org.apache.portals.pluto:chatRoomDemo:3.1.0`

Affected Products

1 product · 2 configurations

Application

plutoapache

2 versions

3.0.03.0.1

Exploits & PoCs

Research use only. For defensive security, authorized penetration testing, and academic research only. Never execute exploit code against systems without explicit written authorization.

EDB-46759webappsjava

Apache Pluto 3.0.0 / 3.0.1 - Persistent Cross-Site Scripting

by Dhiraj Mishra · Apr 26, 2019

Exploit-DB Source

Detection & mitigation playbook

Open-source dependency

Detect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for org.apache.portals.pluto:chatRoomDemo, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update org.apache.portals.pluto:chatRoomDemo to 3.1.0 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2019-0186 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

O3 Security · Impact-Aware SCA

Is CVE-2019-0186 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 or Metasploit module yet. 3 public proof-of-concept references are listed on this page.

Timeline

First exploit

Apr 26, 2019

Disclosed

May 24, 2022

Last updated

Feb 18, 2024

Identifiers

CVE-2019-0186

References

Advisorynvd.nist.gov · CVE 2019 0186 Weblists.apache.org · d093e6b0e5f9b3b50928255451afefd8f8fbdcd5bf28a726769a919a@<pluto user.portals.apache.org>Webportals.apache.org · security Webexploit-db.com Webopenwall.com Webmail-archives.apache.org · <CAAqbB ev=0KNgZmmNAq2=q11i1GYLGN6J [email protected]>

Related vulnerabilities

This CVE is medium severity; 8 of 8 other CVEs with CWE-79 are rated as high or higher (top: critical).

CVE-2026-44267CVE-2026-96632CVE-2026-9086CVE-2026-118246CVE-2026-118251CVE-2026-118253CVE-2026-116797CVE-2026-118244Browse all CWE-79

Provenance

Sources

OSV.devNVDFIRST.org (EPSS)

Last verifiedFeb 18, 2024