CVE-2008-4673: PHP remote file inclusion vulnerability in panel/common/theme/default/header_setup.php in WebBiscuits Software

This week

HIGH 10.0DOWNGRADE

CVE-2008-4673 is a high-severity flaw (CVSS 10.0) affecting events calendar. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

PHP remote file inclusion vulnerability in panel/common/theme/default/header_setup.php in WebBiscuits Software Events Calendar 1.1 allows remote attackers to execute arbitrary PHP code via a URL in the (1) path[docroot] and (2) component parameters.

Why this priority

Critical severity
EPSS top 8%: very likely to be exploited
Public exploit reference

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

Risk facts

CVSS score	10.0 (High)
EPSS exploit chance	4.5% (top 8%)
CISA exploited list	No
Weakness	CWE-94
Published	2008-10-22
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: webbiscuits

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

Am I affected?

Timeline

2008-10-22 10:30 UTCPublished CVE record published
2026-06-16 22:58 UTCUpdated Record last modified

webbiscuits events calendar DOWNGRADE

Affected: 1.1

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.1

1. Check installed version

apt-cache policy events-calendar || rpm -q events-calendar || events-calendar --version

2. No fixed release: DOWNGRADE to a release before 1.1 (Debian / Ubuntu)

apt-cache madison events-calendar sudo apt install events-calendar=<VERSION_BEFORE_1.1> sudo apt-mark hold events-calendar

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

dnf --showduplicates list events-calendar sudo dnf downgrade events-calendar-<VERSION_BEFORE_1.1> sudo dnf versionlock add events-calendar

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: events Calendar 1.1 - Remote File Inclusion

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-2008-4673?

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

Is CVE-2008-4673 being exploited?

CVE-2008-4673 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-2008-4673 affect?

CVE-2008-4673 affects events calendar. Severity is high (CVSS 10.0). PHP remote file inclusion vulnerability in panel/common/theme/default/header_setup.php in WebBiscuits Software Events Calendar 1.1 allows remote attackers to execute arbitrary PHP code via a URL in the (1) path[docroot] and (2) component pa

How urgent is CVE-2008-4673?

Priority 63/100. Critical severity; EPSS top 8%: very likely to be exploited; Public exploit reference

Software pages

PHP vulnerabilities

Related CVEs

CVE-2024-8701 MEDIUM 4.8 UPGRADE The events-calendar WordPress plugin through 1.0.4 does not sanitise and escape some of its settings, which co
CVE-2008-6608 HIGH 7.5 DOWNGRADE Multiple SQL injection vulnerabilities in DevelopItEasy Events Calendar 1.2 allow remote attackers to execute

References

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