MailerPress Plugin up to 2.0.4 on WordPress Campaign Preview Endpoint cross site scripting

Summaryinfo

A vulnerability has been found in MailerPress Plugin up to 2.0.4 on WordPress and classified as problematic. This impacts an unknown function of the component Campaign Preview Endpoint. Performing a manipulation results in cross site scripting. This vulnerability is reported as CVE-2026-8599. The attack is possible to be carried out remotely. No exploit exists. The affected component should be upgraded.

Detailsinfo

A vulnerability classified as problematic has been found in MailerPress Plugin up to 2.0.4 on WordPress. This affects an unknown part of the component Campaign Preview Endpoint. 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 MailerPress – Email Marketing, Newsletter, Email Automation & WooCommerce Emails plugin for WordPress is vulnerable to Stored Cross-Site Scripting via Campaign HTML Content Field in all versions up to, and including, 2.0.4 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with author-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. The public-facing campaign preview endpoint (/mp-email/{id}-slug/) is not affected by this vulnerability, as it applies a Content-Security-Policy header blocking all inline scripts; exploitation is limited to the admin dashboard preview.

The weakness was disclosed by Faizan Shaik. The advisory is shared at wordfence.com. This vulnerability is uniquely identified as CVE-2026-8599 since 05/14/2026. 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. Neither technical details nor an exploit are publicly available. MITRE ATT&CK project uses the attack technique T1059.007 for this issue.

Upgrading to version 2.0.3 eliminates this vulnerability.

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Productinfo

Type

• WordPress Plugin

Name

• MailerPress Plugin

Version

• 2.0.0
• 2.0.1
• 2.0.2
• 2.0.3
• 2.0.4

CPE 2.3info

• 🔒
• 🔒
• 🔒

CPE 2.2info

• 🔒
• 🔒
• 🔒

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