CVE-2005-2689: Multiple cross-site scripting (XSS) vulnerabilities in PostNuke 0.760-RC4b allows remote attackers to inject a

Routine

LOW 2.6DOWNGRADE

CVE-2005-2689 is a low-severity flaw (CVSS 2.6) affecting postnuke. 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 PostNuke 0.760-RC4b allows remote attackers to inject arbitrary web script or HTML via (1) the moderate parameter to the Comments module or (2) htmltext parameter to html/user.php.

Why this priority

Public exploit reference

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

Risk facts

CVSS score	2.6 (Low)
EPSS exploit chance	1.4% (top 27%)
CISA exploited list	No
Published	2005-08-24
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: postnuke software foundation

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

Am I affected?

Timeline

2005-08-24 04:00 UTCPublished CVE record published
2026-06-16 22:15 UTCUpdated Record last modified

postnuke software foundation postnuke DOWNGRADE

Affected: 0.76_rc4b

Fixed in: no fixed release known

Safe to downgrade to: a release before 0.76_rc4b

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 0.76_rc4b (Debian / Ubuntu)

apt-cache madison postnuke sudo apt install postnuke=<VERSION_BEFORE_0.76_rc4b> sudo apt-mark hold postnuke

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

dnf --showduplicates list postnuke sudo dnf downgrade postnuke-<VERSION_BEFORE_0.76_rc4b> sudo dnf versionlock add postnuke

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: PostNuke 0.76 RC4b - 'user.php?htmltext' Cross-Site Scripting
Exploit-DB: PostNuke 0.76 RC4b Comments Module - 'moderate' 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-2005-2689?

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

Is CVE-2005-2689 being exploited?

CVE-2005-2689 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-2005-2689 affect?

CVE-2005-2689 affects postnuke. Severity is low (CVSS 2.6). Multiple cross-site scripting (XSS) vulnerabilities in PostNuke 0.760-RC4b allows remote attackers to inject arbitrary web script or HTML via (1) the moderate parameter to the Comments module or (2) htmltext parameter to html/user.php.

How urgent is CVE-2005-2689?

Priority 32/100. Public exploit reference

Software pages

PHP vulnerabilities

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References

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