CVE-2001-1521: Cross-site scripting (XSS) vulnerability in user.php in PostNuke 0.64 allows remote attackers to inject arbitr

Routine

LOW 2.6DOWNGRADE

CVE-2001-1521 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.

Cross-site scripting (XSS) vulnerability in user.php in PostNuke 0.64 allows remote attackers to inject arbitrary web script or HTML via the uname parameter.

Why this priority

No elevated risk signals yet

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

Risk facts

CVSS score	2.6 (Low)
EPSS exploit chance	1.2% (top 33%)
CISA exploited list	No
Published	2001-12-31
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

2001-12-31 05:00 UTCPublished CVE record published
2026-06-16 21:56 UTCUpdated Record last modified

postnuke software foundation postnuke DOWNGRADE

Affected: 0.62 · 0.63 · 0.64

Fixed in: no fixed release known

Safe to downgrade to: a release before 0.62

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 0.62 (Debian / Ubuntu)

apt-cache madison postnuke sudo apt install postnuke=<VERSION_BEFORE_0.62> sudo apt-mark hold postnuke

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

dnf --showduplicates list postnuke sudo dnf downgrade postnuke-<VERSION_BEFORE_0.62> 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.

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-2001-1521?

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

Is CVE-2001-1521 being exploited?

CVE-2001-1521 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-2001-1521 affect?

CVE-2001-1521 affects postnuke. Severity is low (CVSS 2.6). Cross-site scripting (XSS) vulnerability in user.php in PostNuke 0.64 allows remote attackers to inject arbitrary web script or HTML via the uname parameter.

How urgent is CVE-2001-1521?

Priority 26/100. No elevated risk signals yet.

Software pages

PHP vulnerabilities

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References

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