CVE-2006-2798: Multiple cross-site scripting (XSS) vulnerabilities in phpCommunityCalendar 4.0.3 allow remote attackers to in

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MEDIUM 6.8DOWNGRADE

CVE-2006-2798 is a medium-severity flaw (CVSS 6.8) affecting phpcommunitycalendar. 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 phpCommunityCalendar 4.0.3 allow remote attackers to inject arbitrary web script or HTML via the (1) LoName parameter in (a) week.php and (b) month.php and (2) AddressLink parameter in (c) event.php.

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	2.2% (top 17%)
CISA exploited list	No
Published	2006-06-03
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: phpcommunitycalendar

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

Am I affected?

Timeline

2006-06-03 01:02 UTCPublished CVE record published
2026-06-16 22:25 UTCUpdated Record last modified

phpcommunitycalendar phpcommunitycalendar DOWNGRADE

Affected: 4.0.3

Fixed in: no fixed release known

Safe to downgrade to: a release before 4.0.3

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 4.0.3 (Debian / Ubuntu)

apt-cache madison phpcommunitycalendar sudo apt install phpcommunitycalendar=<VERSION_BEFORE_4.0.3> sudo apt-mark hold phpcommunitycalendar

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

dnf --showduplicates list phpcommunitycalendar sudo dnf downgrade phpcommunitycalendar-<VERSION_BEFORE_4.0.3> sudo dnf versionlock add phpcommunitycalendar

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: phpCommunityCalendar 4.0.3 - Cross-Site Scripting / SQL Injection

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-2006-2798?

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

Is CVE-2006-2798 being exploited?

CVE-2006-2798 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-2006-2798 affect?

CVE-2006-2798 affects phpcommunitycalendar. Severity is medium (CVSS 6.8). Multiple cross-site scripting (XSS) vulnerabilities in phpCommunityCalendar 4.0.3 allow remote attackers to inject arbitrary web script or HTML via the (1) LoName parameter in (a) week.php and (b) month.php and (2) AddressLink parameter in

How urgent is CVE-2006-2798?

Priority 49/100. Public exploit reference

Software pages

PHP vulnerabilities

Related CVEs

CVE-2006-2797 HIGH 7.5 DOWNGRADE Multiple SQL injection vulnerabilities in phpCommunityCalendar 4.0.3 allow remote attackers to execute arbitra
CVE-2005-2882 MEDIUM 4.3 DOWNGRADE Multiple cross-site scripting (XSS) vulnerabilities in phpCommunityCalendar 4.0.3, and possibly earlier versio
CVE-2005-2881 HIGH 7.5 DOWNGRADE phpCommunityCalendar 4.0.3 allows remote attackers to bypass authentication and gain unauthorized access via a
CVE-2005-2880 HIGH 7.5 DOWNGRADE Multiple SQL injection vulnerabilities in phpCommunityCalendar 4.0.3, and possibly earlier versions, allow rem

References

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