CVE-2006-4956: Cross-site scripting (XSS) vulnerability in the updateuser servlet in Neon WebMail for Java before 5.08 allows

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MEDIUM 6.8DOWNGRADE

CVE-2006-4956 is a medium-severity flaw (CVSS 6.8) affecting neon webmail. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Cross-site scripting (XSS) vulnerability in the updateuser servlet in Neon WebMail for Java before 5.08 allows remote attackers to inject arbitrary web script or HTML via the in_name parameter, as used by the Name field.

Why this priority

EPSS top 8%: very likely to be exploited
Public exploit reference

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

Risk facts

CVSS score	6.8 (Medium)
EPSS exploit chance	4.8% (top 8%)
CISA exploited list	No
Published	2006-09-23
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: neosys

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

Am I affected?

Timeline

2006-09-23 10:07 UTCPublished CVE record published
2026-06-16 22:30 UTCUpdated Record last modified

neosys neon webmail DOWNGRADE

Affected: 5.06 · 5.07

Fixed in: no fixed release known

Safe to downgrade to: a release before 5.06

1. Check installed version

apt-cache policy neon-webmail || rpm -q neon-webmail || neon-webmail --version

2. No fixed release: DOWNGRADE to a release before 5.06 (Debian / Ubuntu)

apt-cache madison neon-webmail sudo apt install neon-webmail=<VERSION_BEFORE_5.06> sudo apt-mark hold neon-webmail

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

dnf --showduplicates list neon-webmail sudo dnf downgrade neon-webmail-<VERSION_BEFORE_5.06> sudo dnf versionlock add neon-webmail

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: NeoSys Neon Webmail for Java 5.06/5.07 - 'updateuser?in_name' Servlet 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-2006-4956?

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

Is CVE-2006-4956 being exploited?

CVE-2006-4956 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-2006-4956 affect?

CVE-2006-4956 affects neon webmail. Severity is medium (CVSS 6.8). Cross-site scripting (XSS) vulnerability in the updateuser servlet in Neon WebMail for Java before 5.08 allows remote attackers to inject arbitrary web script or HTML via the in_name parameter, as used by the Name field.

How urgent is CVE-2006-4956?

Priority 52/100. EPSS top 8%: very likely to be exploited; Public exploit reference

Software pages

Java vulnerabilities

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References

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