CVE-2005-3991: Multiple cross-site scripting (XSS) vulnerabilities in phpMyChat 0.14.6 allow remote attackers to inject arbit

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MEDIUM 4.3DOWNGRADE

CVE-2005-3991 is a medium-severity flaw (CVSS 4.3) affecting phpmychat. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Multiple cross-site scripting (XSS) vulnerabilities in phpMyChat 0.14.6 allow remote attackers to inject arbitrary web script or HTML via the medium parameter to (1) start_page.css.php and (2) style.css.php; or the From parameter to users_popupL.php.

Why this priority

Public exploit reference

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

Risk facts

CVSS score	4.3 (Medium)
EPSS exploit chance	1.8% (top 22%)
CISA exploited list	No
Published	2005-12-04
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: phpheaven

Last updated 2026-06-16 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2005-12-04 23:03 UTCPublished CVE record published
2026-06-16 22:18 UTCUpdated Record last modified

phpheaven phpmychat DOWNGRADE

Affected: 0.14.6

Fixed in: no fixed release known

Safe to downgrade to: a release before 0.14.6

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 0.14.6 (Debian / Ubuntu)

apt-cache madison phpmychat sudo apt install phpmychat=<VERSION_BEFORE_0.14.6> sudo apt-mark hold phpmychat

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

dnf --showduplicates list phpmychat sudo dnf downgrade phpmychat-<VERSION_BEFORE_0.14.6> sudo dnf versionlock add phpmychat

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.

Public exploits and detection

Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.

Exploit-DB: PHPMyChat 0.14.6 - 'start_page.css.php?medium' Cross-Site Scripting
Exploit-DB: PHPMyChat 0.14.6 - 'style.css.php?medium' Cross-Site Scripting
Exploit-DB: PHPMyChat 0.14.6 - 'users_popupL.php?From' Cross-Site Scripting

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-2005-3991?

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

Is CVE-2005-3991 being exploited?

CVE-2005-3991 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-2005-3991 affect?

CVE-2005-3991 affects phpmychat. Severity is medium (CVSS 4.3). Multiple cross-site scripting (XSS) vulnerabilities in phpMyChat 0.14.6 allow remote attackers to inject arbitrary web script or HTML via the medium parameter to (1) start_page.css.php and (2) style.css.php; or the From parameter to users_p

How urgent is CVE-2005-3991?

Priority 40/100. Public exploit reference

Software pages

PHP vulnerabilities

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References

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