CVE-2026-8868
Stored XSS in Single Mailchimp WordPress Plugin
Publication date: 2026-05-27
Last updated on: 2026-05-27
Assigner: Wordfence
Description
Description
CVSS Scores
EPSS Scores
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Meta Information
Affected Vendors & Products
| Vendor | Product | Version / Range |
|---|---|---|
| mailchimp | single_mailchimp | to 1.4 (inc) |
Helpful Resources
Exploitability
| CWE ID | Description |
|---|---|
| CWE-79 | The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users. |
Attack-Flow Graph
AI Powered Q&A
Can you explain this vulnerability to me?
The Single Mailchimp plugin for WordPress has a Stored Cross-Site Scripting (XSS) vulnerability in all versions up to and including 1.4. This occurs because the plugin does not properly sanitize or escape user-supplied shortcode attributes such as autocomplete, label, placeholder, btn_text, success_msg, and error_msg. These attributes are directly concatenated into the HTML output by the single_mailchimp() function, allowing an authenticated attacker with contributor-level access or higher to inject malicious scripts. These scripts execute whenever a user visits the affected page.
How can this vulnerability impact me? :
This vulnerability can allow an attacker with contributor-level access to inject arbitrary malicious scripts into pages on your WordPress site. When other users visit these pages, the injected scripts will execute in their browsers. This can lead to theft of user credentials, session hijacking, defacement of the website, or distribution of malware, compromising the security and integrity of your site and its users.