Vulnerabilities / Kit (formerly ConvertKit) – Email Subscribers, Email Newsletter, Email Marketing, Landing Pages and Membership / WPSEC-2026-2850
Kit (formerly ConvertKit) – Email Subscribers, Email Newsletter, Email Marketing, Landing Pages and Membership <= 3.5.0 - Unauthenticated Sensitive Information Exposure via Restricted Post Attachments
Medium 5.3
CWE-200Fixed in 3.5.1
- ID
- WPSEC-2026-2850
- Plugin
- Kit (formerly ConvertKit) – Email Subscribers, Email Newsletter, Email Marketing, Landing Pages and Membership (convertkit)
- Affected
- from 2.1.0 before 3.5.1
- Remediation
- Update to 3.5.1 or later.
- CVSS 3.1
- CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
- Weakness
- CWE-200
- Usage
- Plugin Medium · Affected versions Medium among sites WPSec scans, 2026-11-12
- Attack surface
- Kit (formerly ConvertKit) – Email Subscribers, Email Newsletter, Email Marketing, Landing Pages and Membership on WPSec AttackSurface
- Fix released
- Published
Description
The Kit (formerly ConvertKit) plugin for WordPress is vulnerable to Sensitive Information Exposure in all versions up to, and including, 3.5.0 due to the Member Content feature not restricting attachments of restricted pages and posts in the REST API and on attachment pages. This makes it possible for unauthenticated attackers to obtain the file URLs of media attached to member-only content and access those files.
References
- https://wpsec.com/vuln/WPSEC-2026-2850/
- https://plugins.svn.wordpress.org/convertkit/tags/3.5.1/
- https://wordpress.org/plugins/convertkit/
Published by WPSec. Provided as is, without warranty. Corrections: contact us.
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