Is spiffy-calendar (WordPress plugin) vulnerable?

WordPress spiffy-calendar has 4 known advisories in the phpwarden feed. Feed 2026.10.29.1, updated 2026-10-28.

4advisories
0critical
0on CISA KEV
3no fix recorded
CVETitleSeverityCVSSAffectedFixed in
CVE-2017-9420Cross site scripting (XSS) vulnerability in the Spiffy Calendar plugin before 3.3.0 for WordPress allows remote attackers to inject arbitrarmedium6.1=1.0.0 or =1.0.1 or =1.0.2a or =1.0.3 or =1.1.0 or =1.1.1 or =1.1.2 or =1.1.3 or =1.1.4 or =1.1.5 or =1.1.6 or =1.1.7 or =1.1.8 or =1.2.0 or =1.2.1 or =1.3.0 or =1.3.1 or =2.0.0 or =2.0.1 or =2.1.0 or =2.1.1 or =2.1.2 or =2.1.3 or =3.0.0 or =3.0.1 or =3.0.2 or =3.0.3 or =3.0.4 or =3.0.5 or =3.0.6 or =3.0.7 or =3.0.8 or =3.1.0 or =3.1.1 or =3.1.2 or =3.1.3 or =3.1.4 or =3.1.5 or =3.2.0–
CVE-2022-29434Insecure Direct Object References (IDOR) vulnerability in Spiffy Plugins Spiffy Calendar <= 4.9.0 at WordPress allows an attacker to edit ormedium6.3<=4.9.0–
CVE-2024-0855The Spiffy Calendar WordPress plugin before 4.9.9 doesn't check the event_author parameter, and allows any user to alter it when creating anmedium5.3<4.9.94.9.9
CVE-2022-25599Cross-Site Request Forgery (CSRF) vulnerability leading to event deletion was discovered in Spiffy Calendar WordPress plugin (versions <= 4.medium5.4<=4.9.0–

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.

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