Stored Cross-Site Scripting in Single Mailchimp Plugin for WordPress
CVE-2026-8868

6.4MEDIUM

Key Information:

Vendor

WordPress
Status
Single Mailchimp
Vendor
CVE Published:
27 May 2026

What is CVE-2026-8868?

The Single Mailchimp plugin for WordPress contains a vulnerability that allows authenticated attackers with contributor-level access and above to exploit stored cross-site scripting via the 'single-mailchimp' shortcode. The issue arises from inadequate input sanitization and output escaping for user-supplied shortcode attributes like autocomplete, label, placeholder, btn_text, success_msg, and error_msg. This flaw enables attackers to inject arbitrary web scripts into pages displayed to users, posing significant risks to website security and user data integrity.

Affected Version(s)

Single Mailchimp 0 <= 1.4

References

https://www.wordfence.com/threat-intel/vulnerabilities/id...
https://plugins.trac.wordpress.org/browser/single-mailchi...
https://plugins.trac.wordpress.org/browser/single-mailchi...

CVSS V3.1

Score:
6.4
Severity:
MEDIUM
Confidentiality:
Low
Integrity:
Low
Availability:
Low
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
Low
User Interaction:
None
Scope:
Changed

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Gilang Asra Bilhadi
.