CVE-2026-87917: CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') in dvankooten MC4WP: Mailchimp for WordPress
MC4WP: Mailchimp for WordPress plugin versions up to and including 4.14.0 are vulnerable to reflected Cross-Site Scripting (XSS) via the 'data' Dynamic Content Tag. This vulnerability arises from insufficient input sanitization and output escaping, allowing unauthenticated attackers to inject arbitrary scripts that execute when a user interacts with crafted content.
AI Analysis
Technical Summary
The MC4WP: Mailchimp for WordPress plugin suffers from a reflected Cross-Site Scripting vulnerability (CWE-79) in all versions up to 4.14.0. The flaw is due to improper neutralization of input in the 'data' Dynamic Content Tag, enabling unauthenticated attackers to inject malicious scripts. Exploitation requires tricking a user into performing an action such as clicking a link, leading to script execution in the user's browser context.
Potential Impact
Successful exploitation can lead to partial confidentiality and integrity loss (as indicated by CVSS: C:L/I:L), allowing attackers to execute arbitrary scripts in the context of the affected site. This may result in session hijacking, defacement, or other client-side attacks. Availability is not impacted. The vulnerability requires user interaction but no privileges or authentication.
Mitigation Recommendations
No explicit patch or remediation details are provided in the input data. Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until a fix is applied, users should consider disabling or restricting use of the 'data' Dynamic Content Tag or applying web application firewall rules to block malicious input patterns.
CVE-2026-87917: CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') in dvankooten MC4WP: Mailchimp for WordPress
Description
MC4WP: Mailchimp for WordPress plugin versions up to and including 4.14.0 are vulnerable to reflected Cross-Site Scripting (XSS) via the 'data' Dynamic Content Tag. This vulnerability arises from insufficient input sanitization and output escaping, allowing unauthenticated attackers to inject arbitrary scripts that execute when a user interacts with crafted content.
CVSS v3.1
Score 6.1medium
Affected software
dvankooten
MC4WP: Mailchimp for WordPress
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The MC4WP: Mailchimp for WordPress plugin suffers from a reflected Cross-Site Scripting vulnerability (CWE-79) in all versions up to 4.14.0. The flaw is due to improper neutralization of input in the 'data' Dynamic Content Tag, enabling unauthenticated attackers to inject malicious scripts. Exploitation requires tricking a user into performing an action such as clicking a link, leading to script execution in the user's browser context.
Potential Impact
Successful exploitation can lead to partial confidentiality and integrity loss (as indicated by CVSS: C:L/I:L), allowing attackers to execute arbitrary scripts in the context of the affected site. This may result in session hijacking, defacement, or other client-side attacks. Availability is not impacted. The vulnerability requires user interaction but no privileges or authentication.
Mitigation Recommendations
No explicit patch or remediation details are provided in the input data. Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until a fix is applied, users should consider disabling or restricting use of the 'data' Dynamic Content Tag or applying web application firewall rules to block malicious input patterns.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- Wordfence
- Date Reserved
- 2026-09-09T15:56:01.475Z
- Cvss Version
- 3.1
- State
- PUBLISHED
Threat ID: 6aae3e0455bf5e2cf54897db
Added to database: 09/19/2026, 07:47:16 UTC
Last enriched: 09/19/2026, 08:02:02 UTC
Last updated: 09/19/2026, 08:29:02 UTC
Views: 5
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