CVE-2025-9850: Evenium <= 1.3.11 - Authenticated (Contributor+) Stored Cross-Site Scripting

Severity: medium (CVSS 6.4 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2025-09-11 · updated 2026-10-19
Weakness: CWE-79

Description

The Evenium plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the plugin's 'evenium_single_event' shortcode in all versions up to, and including, 1.3.11 due to insufficient input sanitization and output escaping on user supplied attributes. This makes it possible for authenticated attackers, with contributor-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.

Affected products

Evenium: through 1.3.11

References

https://plugins.trac.wordpress.org/browser/evenium/trunk/src/evenium_quicktags.php#L27
https://www.wordfence.com/threat-intel/vulnerabilities/id/394732cc-94b5-4fbf-bd78-da18791724be?source=cve

Get alerted when CVE-2025-9850 or the next vulnerability affects your stack