CVE-2009-1607: Cross-site scripting (XSS) vulnerability in the administrator panel in phpForm.net LinkBase 2.0 allows remote

Routine

MEDIUM 4.3DOWNGRADE

CVE-2009-1607 is a medium-severity flaw (CVSS 4.3) affecting linkbase. 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 administrator panel in phpForm.net LinkBase 2.0 allows remote attackers to inject arbitrary web script or HTML via the username in a registration, which is not properly handled when the administrator accesses the Users menu.

Why this priority

Public exploit reference

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

Risk facts

CVSS score	4.3 (Medium)
EPSS exploit chance	1.5% (top 26%)
CISA exploited list	No
Weakness	CWE-79
Published	2009-05-11
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: linkbase

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

Am I affected?

Timeline

2009-05-11 20:00 UTCPublished CVE record published
2026-06-16 23:07 UTCUpdated Record last modified

linkbase linkbase DOWNGRADE

Affected: 2.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 2.0

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 2.0 (Debian / Ubuntu)

apt-cache madison linkbase sudo apt install linkbase=<VERSION_BEFORE_2.0> sudo apt-mark hold linkbase

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

dnf --showduplicates list linkbase sudo dnf downgrade linkbase-<VERSION_BEFORE_2.0> sudo dnf versionlock add linkbase

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: LinkBase 2.0 - Remote Cookie Grabber

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-2009-1607?

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

Is CVE-2009-1607 being exploited?

CVE-2009-1607 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-2009-1607 affect?

CVE-2009-1607 affects linkbase. Severity is medium (CVSS 4.3). Cross-site scripting (XSS) vulnerability in the administrator panel in phpForm.net LinkBase 2.0 allows remote attackers to inject arbitrary web script or HTML via the username in a registration, which is not properly handled when the admini

How urgent is CVE-2009-1607?

Priority 39/100. Public exploit reference

References

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