CVE-2026-8599: CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') in mailerpress MailerPress – Email Marketing, Newsletter, Email Automation & WooCommerce Emails
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.
AI Analysis
Technical Summary
CVE-2026-8599 is a stored cross-site scripting vulnerability in the MailerPress – Email Marketing, Newsletter, Email Automation & WooCommerce Emails WordPress plugin. The issue exists in all versions up to and including 2.0.4, where the Campaign HTML Content Field does not properly sanitize or escape input, allowing authenticated users with author-level access or higher to inject arbitrary scripts. These scripts execute in the admin dashboard preview, potentially impacting users with access to that interface. The public-facing campaign preview endpoint is protected by a Content-Security-Policy header that blocks inline scripts, preventing exploitation there.
Potential Impact
An attacker with author-level or higher privileges can inject malicious scripts into the Campaign HTML Content Field that execute in the admin dashboard preview context. This can lead to limited confidentiality and integrity impacts within the admin interface, such as session hijacking or unauthorized actions. The public campaign preview endpoint is not vulnerable due to enforced Content-Security-Policy. There is no impact on availability. The CVSS v3.1 score is 6.4 (medium severity).
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until a fix is available, restrict author-level access to trusted users only and avoid using the admin dashboard preview feature for campaigns containing untrusted content. Monitor vendor channels for updates or patches addressing this vulnerability.
CVE-2026-8599: CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') in mailerpress MailerPress – Email Marketing, Newsletter, Email Automation & WooCommerce Emails
Description
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.
CVSS v3.1
Score 6.4medium
Affected software
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-8599 is a stored cross-site scripting vulnerability in the MailerPress – Email Marketing, Newsletter, Email Automation & WooCommerce Emails WordPress plugin. The issue exists in all versions up to and including 2.0.4, where the Campaign HTML Content Field does not properly sanitize or escape input, allowing authenticated users with author-level access or higher to inject arbitrary scripts. These scripts execute in the admin dashboard preview, potentially impacting users with access to that interface. The public-facing campaign preview endpoint is protected by a Content-Security-Policy header that blocks inline scripts, preventing exploitation there.
Potential Impact
An attacker with author-level or higher privileges can inject malicious scripts into the Campaign HTML Content Field that execute in the admin dashboard preview context. This can lead to limited confidentiality and integrity impacts within the admin interface, such as session hijacking or unauthorized actions. The public campaign preview endpoint is not vulnerable due to enforced Content-Security-Policy. There is no impact on availability. The CVSS v3.1 score is 6.4 (medium severity).
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until a fix is available, restrict author-level access to trusted users only and avoid using the admin dashboard preview feature for campaigns containing untrusted content. Monitor vendor channels for updates or patches addressing this vulnerability.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- Wordfence
- Date Reserved
- 2026-05-14T14:57:19.613Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a27e32c8dd33fbd851260f0
Added to database: 06/09/2026, 09:55:56 UTC
Last enriched: 06/09/2026, 10:11:03 UTC
Last updated: 07/31/2026, 19:23:00 UTC
Views: 52
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