Is calendar-plugin (WordPress plugin) vulnerable?

WordPress calendar-plugin has 1 known advisory in the phpwarden feed. Feed 2026.10.29.1, updated 2026-10-28.

1advisories

0critical

0on CISA KEV

1no fix recorded

CVE	Title	Severity	CVSS	Affected	Fixed in
CVE-2021-34667	The Calendar_plugin WordPress plugin is vulnerable to Reflected Cross-Site Scripting due to the use of `$_SERVER['PHP_SELF']` in the ~/calen	medium	6.1	`<=1.0`	–

Am I affected?

Find out in one command. phpwarden checks your WordPress install against this advisory and 20,000+ others, ranked by real-world exploitation (CISA KEV + EPSS). Free, offline, open data.

# PHP projects (recommended)
composer require --dev phpwarden/phpwarden
# then
vendor/bin/phpwarden wordpress /var/www/html

# or, without Composer
pipx install phpwarden   &&   phpwarden wordpress /var/www/html

Or keep it checked automatically with the GitHub Action or a nightly cron; see WordPress docs.

Install docs How findings are ranked

A version is vulnerable when it falls inside an affected range and below the fixed version. phpwarden applies these ranges to the exact versions in your lockfile or install, so you only see what applies to you.