WordPress MC4WP plugin <= 4.8.6 - Authenticated Stored Cross-Site Scripting (XSS) vulnerability
Priority LOW 23CWE-79Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- High
- 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
Authenticated (admin or higher user role) Stored Cross-Site Scripting (XSS) vulnerability in ibericode's MC4WP plugin <= 4.8.6 at WordPress.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00529 45th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet
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 | <= 4.8.6 – 4.8.6 | — | No fix listed | CNA |
- MC4WP: Mailchimp for WordPress Vendordvankooten Affected <= 4.8.6 – 4.8.6 Fixed in — No fix listed CNA
CPE configurations NVD · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:ibericode:mailchimp_for_wordpress:*:*:*:*:*:wordpress:*:* | up to 4.8.6 | Vulnerable | dvankooten |
- cpe:2.3:a:ibericode:mailchimp_for_wordpress:*:*:*:*:*:wordpress:*:* Versions up to 4.8.6 Vulnerable ·dvankooten
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2021-36833
- 2026-10-03 Alias added: GHSA-xhfm-f7f9-cpx6
References
More dvankooten Mailchimp For Wordpress vulnerabilities
- TI-2017-13750 The mailchimp-for-wp plugin before 4.1.8 for WordPress has XSS via the return value of add_query_arg. CVSS 3.0MEDIUM 6.1
- TI-2016-08909 The mailchimp-for-wp plugin before 4.0.11 for WordPress has XSS on the integration settings page. CVSS 3.0MEDIUM 6.1
Sources
- CVE-2021-36833 · CVE Program
- CVE-2021-36833 · NVD
- FIRST EPSS
- GHSA-xhfm-f7f9-cpx6 · GitHub Advisory Database · CC BY 4.0
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