The Single Mailchimp plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'single-mailchimp' shortcode in all versions up to, and including, 1.4. This is due to insufficient input sanitization and output escaping on user-supplied shortcode attributes (autocomplete, label, placeholder, btn_text, success_msg, error_msg) which are concatenated directly into HTML output by the single_mailchimp() function in shortcodes.php. This makes it possible for authenticated attackers, with contributor-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.
Metrics
Affected Vendors & Products
References
History
Wed, 27 May 2026 13:30:00 +0000
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ssvc
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Wed, 27 May 2026 10:30:00 +0000
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Jonathan-robrecht
Jonathan-robrecht single Mailchimp Wordpress Wordpress wordpress |
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Jonathan-robrecht
Jonathan-robrecht single Mailchimp Wordpress Wordpress wordpress |
Wed, 27 May 2026 06:30:00 +0000
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| Description | The Single Mailchimp plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'single-mailchimp' shortcode in all versions up to, and including, 1.4. This is due to insufficient input sanitization and output escaping on user-supplied shortcode attributes (autocomplete, label, placeholder, btn_text, success_msg, error_msg) which are concatenated directly into HTML output by the single_mailchimp() function in shortcodes.php. This makes it possible for authenticated attackers, with contributor-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. | |
| Title | Single Mailchimp <= 1.4 - Authenticated (Contributor+) Stored Cross-Site Scripting via Shortcode Attributes | |
| Weaknesses | CWE-79 | |
| References |
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| Metrics |
cvssV3_1
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Status: PUBLISHED
Assigner: Wordfence
Published: 2026-05-27T05:31:19.290Z
Updated: 2026-05-27T10:40:01.426Z
Reserved: 2026-05-18T20:18:00.425Z
Link: CVE-2026-8868
Updated: 2026-05-27T10:39:56.257Z
Status : Received
Published: 2026-05-27T07:16:16.220
Modified: 2026-05-27T07:16:16.220
Link: CVE-2026-8868
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