CVE-2006-5853: Cross-site scripting (XSS) vulnerability in logon.aspx in Immediacy CMS (Immediacy .NET CMS) 5.2 allows remote

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MEDIUM 6.8DOWNGRADE

CVE-2006-5853 is a medium-severity flaw (CVSS 6.8) affecting immediacy .net cms. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Cross-site scripting (XSS) vulnerability in logon.aspx in Immediacy CMS (Immediacy .NET CMS) 5.2 allows remote attackers to inject arbitrary web script or HTML via the lang parameter, which is returned to the client in a lang cookie.

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	2006-11-10
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: immediacy

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

Am I affected?

Timeline

2006-11-10 02:07 UTCPublished CVE record published
2026-06-16 22:32 UTCUpdated Record last modified

immediacy immediacy .net cms DOWNGRADE

Affected: 5.2

Fixed in: no fixed release known

Safe to downgrade to: a release before 5.2

1. Check installed version

apt-cache policy immediacy-.net-cms || rpm -q immediacy-.net-cms || immediacy-.net-cms --version

2. No fixed release: DOWNGRADE to a release before 5.2 (Debian / Ubuntu)

apt-cache madison immediacy-.net-cms sudo apt install immediacy-.net-cms=<VERSION_BEFORE_5.2> sudo apt-mark hold immediacy-.net-cms

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

dnf --showduplicates list immediacy-.net-cms sudo dnf downgrade immediacy-.net-cms-<VERSION_BEFORE_5.2> sudo dnf versionlock add immediacy-.net-cms

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: Immediacy .NET CMS 5.2 - 'Logon.aspx' 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-2006-5853?

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

Is CVE-2006-5853 being exploited?

CVE-2006-5853 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-2006-5853 affect?

CVE-2006-5853 affects immediacy .net cms. Severity is medium (CVSS 6.8). Cross-site scripting (XSS) vulnerability in logon.aspx in Immediacy CMS (Immediacy .NET CMS) 5.2 allows remote attackers to inject arbitrary web script or HTML via the lang parameter, which is returned to the client in a lang cookie.

How urgent is CVE-2006-5853?

Priority 49/100. Public exploit reference

References

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