Quick answers
- Is CVE-2026-118167 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-118167 being exploited in the wild.
- How severe is CVE-2026-118167?
- Informational severity, published 6 November 2026.
- Which products and versions are affected?
- MC4WP Mailchimp for WordPress before 4.15.0.
- Is there a fix for CVE-2026-118167?
- Yes: fixed in 4.15.0. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
- How is CVE-2026-118167 attacked?
- It is attacked over the network, in a software library.
- Am I affected by CVE-2026-118167?
- Check whether you run MC4WP Mailchimp for WordPress at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.
How to fix
- Fixed in: 4.15.0
Technical details
The vulnerability is an incorrect authorization flaw (CWE-863) where the plugin does not validate that the audience ID in a sign-up form request matches the audience configured by the site owner. An unauthenticated attacker can craft requests to subscribe arbitrary email addresses to any audience within the connected Mailchimp account by manipulating the audience parameter. The fix is available in version 4.15.0.
Affected products
- MC4WP Mailchimp for WordPress before 4.15.0
Timeline
- 2026-11-04: disclosed
- 2026-11-06: advisory