CVE-2006-6364: Cross-site scripting (XSS) vulnerability in error.php in Inside Systems Mail (ISMail) 2.0 and earlier allows r

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MEDIUM 6.8DOWNGRADE

CVE-2006-6364 is a medium-severity flaw (CVSS 6.8) affecting inside systems. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Cross-site scripting (XSS) vulnerability in error.php in Inside Systems Mail (ISMail) 2.0 and earlier allows remote attackers to inject arbitrary web script or HTML via the error parameter.

Why this priority

Public exploit reference

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

Risk facts

CVSS score	6.8 (Medium)
EPSS exploit chance	2.1% (top 18%)
CISA exploited list	No
Published	2006-12-07
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: inside systems

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

Am I affected?

Timeline

2006-12-07 11:28 UTCPublished CVE record published
2026-06-16 22:32 UTCUpdated Record last modified

inside systems inside systems DOWNGRADE

Affected: mail_2.0

Fixed in: no fixed release known

Safe to downgrade to: a release before mail_2.0

1. Check installed version

apt-cache policy inside-systems || rpm -q inside-systems || inside-systems --version

2. No fixed release: DOWNGRADE to a release before mail_2.0 (Debian / Ubuntu)

apt-cache madison inside-systems sudo apt install inside-systems=<VERSION_BEFORE_mail_2.0> sudo apt-mark hold inside-systems

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

dnf --showduplicates list inside-systems sudo dnf downgrade inside-systems-<VERSION_BEFORE_mail_2.0> sudo dnf versionlock add inside-systems

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: Inside Systems Mail 2.0 - 'error.php' 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-2006-6364?

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

Is CVE-2006-6364 being exploited?

CVE-2006-6364 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-2006-6364 affect?

CVE-2006-6364 affects inside systems. Severity is medium (CVSS 6.8). Cross-site scripting (XSS) vulnerability in error.php in Inside Systems Mail (ISMail) 2.0 and earlier allows remote attackers to inject arbitrary web script or HTML via the error parameter.

How urgent is CVE-2006-6364?

Priority 49/100. Public exploit reference

Software pages

PHP vulnerabilities

References

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