CVE-2024-3961: Convertkit - Email Marketing, Email Newsletter And Landing Pages

Medium severity, CVSS 5.3. EPSS: 0.4% chance of exploitation in the next 30 days.

The ConvertKit – Email Newsletter, Email Marketing, Subscribers and Landing Pages plugin for WordPress is vulnerable to unauthorized modification of data due to a missing capability check on the tag_subscriber function in all versions up to, and including, 2.4.9. This makes it possible for unauthenticated attackers to subscribe users to tags. Financial damages may occur to site owners if their API quota is exceeded.

Affected products

• Convertkit Convertkit - Email Marketing, Email Newsletter And Landing Pages: before 2.4.9.1 (fixed in 2.4.9.1)

Published 2024-06-21. Last modified 2026-06-17.