What’s Vulnerable › Vulnerabilities

CVE-2024-8549: Simple Calendar – Google Calendar Plugin <= 3.4.2 - Reflected Cross-Site Scripting

• Severity: medium (CVSS 6.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2024-09-25 · updated 2026-06-17
• Weakness: CWE-79

Description

The Simple Calendar – Google Calendar Plugin plugin for WordPress is vulnerable to Reflected Cross-Site Scripting due to the use of add_query_arg without appropriate escaping on the URL in all versions up to, and including, 3.4.2. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that execute if they can successfully trick a user into performing an action such as clicking on a link.

Affected products

• simplecalendar Simple Calendar – Google Calendar Plugin: before 3.4.3 — fixed in 3.4.3

How to fix

Upgrade to a fixed version: simplecalendar Simple Calendar – Google Calendar Plugin 3.4.3. Check the vendor advisory for mitigations.

References

• https://plugins.trac.wordpress.org/changeset/3156894/google-calendar-events/trunk/includes/admin/notices.php
• https://plugins.trac.wordpress.org/changeset?sfp_email=&sfph_mail=&reponame=&old=3156894%40google-calendar-events&new=3156894%40google-calendar-events&sfp_email=&sfph_mail=
• https://www.wordfence.com/threat-intel/vulnerabilities/id/17ae3f22-6426-48f7-93e6-c0ad515b329a?source=cve

Get alerted when CVE-2024-8549 or the next vulnerability affects your stack