5.3
Medium
CVE-2026-118167 MC4WP: Mailchimp for WordPress < 4.15.0 - Unauthenticated Subscription Audience Override
Description
The MC4WP: Mailchimp for WordPress plugin before 4.15.0 does not validate that the Mailchimp audience a sign-up form or bundled integration subscribes a visitor to matches the audience configured by the site owner, allowing unauthenticated visitors to subscribe arbitrary email addresses to any other audience in the site's connected Mailchimp account.
CVSS 3.1 detail
Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:NExploitable remotely over the network, without an account and without any user action; the impact on data or service is limited.
- Attack vector
- Network
- Attack complexity
- Low
- Privileges required
- None
- Interaction
- None
- Scope
- Unchanged
- Confidentiality
- None
- Integrity
- Low
- Availability
- None
Affected products and versions
| Product | Affected versions | Fixed in |
|---|---|---|
| MC4WP: Mailchimp for WordPress 4.15 | earliest → < 4.15.0 | 4.15.0 |