MC4WP: Mailchimp for WordPress <= 4.14.0 — Unauthenticated Arbitrary Shortcode Execution
CVE-2026-118166Published · Updated Action summary
Affected: ≤4.14.0Update to 4.15.0 or newer
All remediation steps- Severity
- Medium6.5
- CVSS
- 6.5CVSS 3.1 · CNA (Wordfence)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:NWhat does this vector mean?
AV:NAttack vector- Network
AC:LAttack complexity- Low
PR:NPrivileges required- None
UI:NUser interaction- None
S:UScope- Unchanged
C:LConfidentiality- Low
I:LIntegrity- Low
A:NAvailability- None
- Required access
- No account needed
- Exploit prediction (EPSS)
- 0.2% chance in 30 days7th percentile
- CISA KEV
- Not listed
On this page8
Am I affected?
MC4WP: Mailchimp for WordPress mailchimp-for-wp
- Affected≤ 4.14.0
- Patched in4.15.0
Update to 4.15.0 or newer.
You are affected if you run ≤ 4.14.0. Version 4.15.0 and later are not affected by this issue.
- Check your version: in wp-admin go to Plugins → Installed Plugins and read the version under MC4WP: Mailchimp for WordPress.
- No admin access? Run a passive check of your site. It reads public files only.
- No account is needed to exploit this. Treat any exposed site on an affected version as at risk.
What to do
- Update to version 4.15.0, or a newer patched version
- Rotate administrator passwords and application secrets if the site ran a vulnerable version while publicly reachable.
- Watch MC4WP: Mailchimp for WordPress to get an email when the next vulnerability is published.
Advisory
Source description from Wordfence Intelligence, credited to Jakub Herman.
The MC4WP: Mailchimp for WordPress plugin for WordPress is vulnerable to Arbitrary Shortcode Execution in all versions up to, and including, 4.14.0. This is due to the use of do_shortcode() on user supplied input. This makes it possible for unauthenticated attackers to execute arbitrary shortcodes registered on the site. The impact depends on which shortcodes the site has registered, so a site running a plugin whose shortcodes expose data or perform actions is affected more severely.
Exploits & references
Proof-of-concept & detection
No public proof-of-concept or detection template is known for this vulnerability.
Advisories & patches
- Advisorywordfence.com
Related CVEs
More in MC4WP: Mailchimp for WordPress
All 16| Severity | Vulnerability | CVE | Published |
|---|---|---|---|
| Medium5.3 | Missing Authorization ≤4.14.1Update to 4.15.0 | CVE-2026-27356 | |
| Medium5.3 | Missing Authorization ≤4.14.0Update to 4.15.0 | CVE-2026-118167 | |
| Medium6.1 | Reflected Cross-Site Scripting via 'data' Dynamic Content Tag ≤4.14.0Update to 4.14.1 | CVE-2026-87917 | |
| Medium6.4 | Authenticated (Author+) Stored Cross-Site Scripting via Form Response Messages ≤4.12.0Update to 4.12.1 | CVE-2026-4561 | |
| Medium6.5 | Missing Authorization to Unauthenticated Arbitrary Subscription Deletion ≤4.11.1Update to 4.12.0 | CVE-2026-1781 |
- Medium5.3Missing Authorization
≤4.14.1Update to 4.15.0
- Medium5.3Missing Authorization
≤4.14.0Update to 4.15.0
- Medium6.1Reflected Cross-Site Scripting via 'data' Dynamic Content Tag
≤4.14.0Update to 4.14.1
- Medium6.4Authenticated (Author+) Stored Cross-Site Scripting via Form Response Messages
≤4.12.0Update to 4.12.1
- Medium6.5Missing Authorization to Unauthenticated Arbitrary Subscription Deletion
≤4.11.1Update to 4.12.0
Timeline
CVE published
Severity medium, CVSS 6.5
Record last updated
Sources & licenses
Wordfence record- Vulnerability data
- Wordfence Intelligence. [object Object] Licensed under the CC BY-SA 4.0.
- CVE® identifiers
- [object Object]. Used under the CVE Program. CVE® is a registered trademark of The MITRE Corporation.
- CVSS / CWE
- National Vulnerability Database (NVD), shown unmodified. This product uses the NVD API but is not endorsed or certified by the NVD.
- EPSS
- Exploit Prediction Scoring System by FIRST.org.
- VulnCrest content
- Summary, remediation guidance and page layout © VulnCrest. Not sourced from NVD.