jonathan-robrecht Single Mailchimp Plugin up to 1.4 on WordPress Shortcode shortcodes.php single_mailchimp cross site scripting

Summaryinfo

A vulnerability marked as problematic has been reported in jonathan-robrecht Single Mailchimp Plugin up to 1.4 on WordPress. This affects the function single_mailchimp of the file shortcodes.php of the component Shortcode Handler. Performing a manipulation results in cross site scripting. This vulnerability is identified as CVE-2026-8868. The attack can be initiated remotely. There is not any exploit available.

Detailsinfo

A vulnerability was found in jonathan-robrecht Single Mailchimp Plugin up to 1.4 on WordPress. It has been classified as problematic. This affects the function single_mailchimp of the file shortcodes.php of the component Shortcode Handler. The manipulation with an unknown input leads to a cross site scripting vulnerability. CWE is classifying the issue as 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. This is going to have an impact on integrity. The summary by CVE is:

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.

The weakness was released by Gilang Asra Bilhadi. The advisory is shared at wordfence.com. This vulnerability is uniquely identified as CVE-2026-8868 since 05/18/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. It demands that the victim is doing some kind of user interaction. Technical details are known, but no exploit is available. MITRE ATT&CK project uses the attack technique T1059.007 for this issue.

By approaching the search of inurl:shortcodes.php it is possible to find vulnerable targets with Google Hacking.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Productinfo

Type

• WordPress Plugin

Vendor

• jonathan-robrecht

Name

• Single Mailchimp Plugin

Version

• 1.0
• 1.1
• 1.2
• 1.3
• 1.4

CPE 2.3info

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• 🔒
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CPE 2.2info

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If you want to get the best quality for vulnerability data then you always have to consider VulDB.

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