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CVE-2021-36833: WordPress MC4WP plugin <= 4.8.6 - Authenticated Stored Cross-Site Scripting (XSS) vulnerability

• Severity: medium (CVSS 4.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2022-05-20 · updated 2026-06-17
• Weakness: CWE-79

Description

Authenticated (admin or higher user role) Stored Cross-Site Scripting (XSS) vulnerability in ibericode's MC4WP plugin <= 4.8.6 at WordPress.

Affected products

• ibericode MC4WP: Mailchimp for WordPress: through 4.8.6

References

• https://patchstack.com/database/vulnerability/mailchimp-for-wp/wordpress-mc4wp-plugin-4-8-6-authenticated-stored-cross-site-scripting-xss-vulnerability
• https://wordpress.org/plugins/mailchimp-for-wp/#developers
• https://patchstack.com/database/vulnerability/mailchimp-for-wp/wordpress-mc4wp-plugin-4-8-6-authenticated-stored-cross-site-scripting-xss-vulnerability
• https://wordpress.org/plugins/mailchimp-for-wp/#developers

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