What’s Vulnerable › Vulnerabilities

CVE-2024-3961: ConvertKit <= 2.4.9 - Missing Authorization

• Severity: medium (CVSS 5.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2024-06-21 · updated 2026-06-17
• Weakness: CWE-862

Description

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: before 2.4.9.1 — fixed in 2.4.9.1

How to fix

Upgrade to a fixed version: ConvertKit 2.4.9.1. Check the vendor advisory for mitigations.

References

• https://plugins.trac.wordpress.org/changeset?sfp_email=&sfph_mail=&reponame=&new=3104932%40convertkit%2Ftrunk&old=3085997%40convertkit%2Ftrunk&sfp_email=&sfph_mail=
• https://www.wordfence.com/threat-intel/vulnerabilities/id/79d828b8-aea2-4705-ae23-ac70133a6c3e?source=cve
• https://plugins.trac.wordpress.org/changeset?sfp_email=&sfph_mail=&reponame=&new=3104932%40convertkit%2Ftrunk&old=3085997%40convertkit%2Ftrunk&sfp_email=&sfph_mail=
• https://www.wordfence.com/threat-intel/vulnerabilities/id/79d828b8-aea2-4705-ae23-ac70133a6c3e?source=cve

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