CVE-2023-30319: Cross Site Scripting (XSS) vulnerability in username field in /src/chatbotapp/LoginServlet.java in wliang6 Cha

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CRITICAL 9.6DOWNGRADE

CVE-2023-30319 is a critical-severity flaw (CVSS 9.6) affecting chatengine. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Cross Site Scripting (XSS) vulnerability in username field in /src/chatbotapp/LoginServlet.java in wliang6 ChatEngine commit fded8e710ad59f816867ad47d7fc4862f6502f3e, allows attackers to execute arbitrary code.

Why this priority

Critical severity
Public exploit reference

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	9.6 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.9% (top 41%)
CISA exploited list	No
Weakness	CWE-79
Published	2023-07-06
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: chatengine project

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2023-07-06 16:15 UTCPublished CVE record published
2026-06-17 05:54 UTCUpdated Record last modified

chatengine project chatengine DOWNGRADE

Affected: 1.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.0

1. Check installed version

apt-cache policy chatengine || rpm -q chatengine || chatengine --version

2. No fixed release: DOWNGRADE to a release before 1.0 (Debian / Ubuntu)

apt-cache madison chatengine sudo apt install chatengine=<VERSION_BEFORE_1.0> sudo apt-mark hold chatengine

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list chatengine sudo dnf downgrade chatengine-<VERSION_BEFORE_1.0> sudo dnf versionlock add chatengine

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2023-30319?

chatengine: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2023-30319 being exploited?

CVE-2023-30319 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2023-30319 affect?

CVE-2023-30319 affects chatengine. Severity is critical (CVSS 9.6). Cross Site Scripting (XSS) vulnerability in username field in /src/chatbotapp/LoginServlet.java in wliang6 ChatEngine commit fded8e710ad59f816867ad47d7fc4862f6502f3e, allows attackers to execute arbitrary code.

How urgent is CVE-2023-30319?

Priority 53/100. Critical severity; Public exploit reference

Software pages

Java vulnerabilities

Related CVEs

CVE-2023-30326 MEDIUM 6.1 DOWNGRADE Cross Site Scripting (XSS) vulnerability in username field in /WebContent/WEB-INF/lib/chatbox.jsp in wliang6 C
CVE-2023-30325 HIGH 7.5 DOWNGRADE SQL Injection vulnerability in textMessage parameter in /src/chatbotapp/chatWindow.java in wliang6 ChatEngine
CVE-2023-30323 HIGH 7.5 DOWNGRADE SQL Injection vulnerability in username field in /src/chatbotapp/chatWindow.java in Payatu ChatEngine v.1.0, a
CVE-2023-30322 MEDIUM 5.4 DOWNGRADE Cross Site Scripting (XSS) vulnerability in username field in /src/chatbotapp/chatWindow.java in Payatu ChatEn
CVE-2023-30321 CRITICAL 9.0 DOWNGRADE Cross Site Scripting (XSS) vulnerability in textMessage field in /src/chatbotapp/LoginServlet.java in wliang6

References

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