CVE-2006-1291: publish.ical.php in Jim Hu and Chad Little PHP iCalendar 2.21 and earlier does not require authentication for

Q: How do I fix CVE-2006-1291?

php icalendar: upgrade to newer than 2.2.1. Exact commands for each OS are on this page.

Q: Is CVE-2006-1291 being exploited?

CVE-2006-1291 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2006-1291 affect?

CVE-2006-1291 affects php icalendar. Severity is high (CVSS 7.5). publish.ical.php in Jim Hu and Chad Little PHP iCalendar 2.21 and earlier does not require authentication for write access to the calendars directory, which allows remote attackers to upload and execute arbitrary PHP scripts via a WebDAV PU

Q: How urgent is CVE-2006-1291?

Priority 55/100. High severity; EPSS top 6%: very likely to be exploited; Public exploit reference

This month

HIGH 7.5UPGRADE

CVE-2006-1291 is a high-severity flaw (CVSS 7.5) affecting php icalendar. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

publish.ical.php in Jim Hu and Chad Little PHP iCalendar 2.21 and earlier does not require authentication for write access to the calendars directory, which allows remote attackers to upload and execute arbitrary PHP scripts via a WebDAV PUT request with a filename containing a .php extension and a trailing null character.

Why this priority

High severity
EPSS top 6%: very likely to be exploited
Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	7.5 (High)
EPSS exploit chance	7.1% (top 6%)
CISA exploited list	No
Published	2006-03-19
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: php icalendar

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

Am I affected?

Timeline

2006-03-19 23:02 UTCPublished CVE record published
2026-06-16 22:22 UTCUpdated Record last modified

php icalendar php icalendar UPGRADE

Affected: <= 2.2.1 · 2.0 · 2.0.1 · 2.0a2 · 2.0b · 2.0c · 2.1

Fixed in: newer than 2.2.1

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy php-icalendar || rpm -q php-icalendar || php-icalendar --version

2. UPGRADE to newer than 2.2.1 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade php-icalendar

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade php-icalendar

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

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: PHP iCalendar 2.21 - 'publish.ical.php' Remote Code Execution

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-2006-1291?

php icalendar: upgrade to newer than 2.2.1. Exact commands for each OS are on this page.

Is CVE-2006-1291 being exploited?

CVE-2006-1291 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-2006-1291 affect?

CVE-2006-1291 affects php icalendar. Severity is high (CVSS 7.5). publish.ical.php in Jim Hu and Chad Little PHP iCalendar 2.21 and earlier does not require authentication for write access to the calendars directory, which allows remote attackers to upload and execute arbitrary PHP scripts via a WebDAV PU

How urgent is CVE-2006-1291?

Priority 55/100. High severity; EPSS top 6%: very likely to be exploited; Public exploit reference

Software pages

PHP vulnerabilities

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References

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