MC4WP: Mailchimp for WordPress 4.9.9 - 4.9.16 - Reflected Cross-Site Scripting
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- Required
- Attack complexity
- Low
- Impact type
- Cross-site scripting
- Confidentiality · integrity · availability
- Low · Low · None
- Fix status
- No fix listed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-79.
Summary
The MC4WP: Mailchimp for WordPress plugin for WordPress is vulnerable to Reflected Cross-Site Scripting via the 'email' parameter when a placeholder such as {email} is used for the field in versions 4.9.9 to 4.9.16 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that execute if they can successfully trick a user into performing an action such as clicking on a link.
Why it matters now
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| dvankooten | MC4WP: Mailchimp for WordPress | 4.9.9 – 4.9.16 | — | No fix listed | CNA |
- MC4WP: Mailchimp for WordPress Vendordvankooten Affected 4.9.9 – 4.9.16 Fixed in — No fix listed CNA
CPE configurations NVD · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:ibericode:mailchimp:*:*:*:*:*:wordpress:*:* | 4.9.9 – 4.9.16 | Vulnerable | dvankooten |
- cpe:2.3:a:ibericode:mailchimp:*:*:*:*:*:wordpress:*:* Versions 4.9.9 – 4.9.16 Vulnerable ·dvankooten
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2024-8850
- 2026-10-03 Alias added: GHSA-m4mc-hq8f-pjxg
References
More dvankooten Mailchimp vulnerabilities
- TI-2023-15799 WordPress MailChimp Subscribe Forms Plugin <= 4.0.9.3 is vulnerable to Open Redirection CVSS 3.1MEDIUM 6.1
- TI-2024-08051 MailChimp for Wordpress <= 4.9.16 - Authenticated (Administrator+) Stored Cross-Site Scripting CVSS 3.1MEDIUM 5.5
- TI-2023-28329 WordPress MC4WP plugin <= 4.9.9 - Broken Access Control vulnerability CVSS 3.1MEDIUM 5.3
Sources
- CVE-2024-8850 · CVE Program
- CVE-2024-8850 · NVD
- FIRST EPSS
- GHSA-m4mc-hq8f-pjxg · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences