CVE Catalog

CVE-2026-8853

MediumCVSS 4.4
Published: Updated: Translated: NVD NIST

Exploitation Probability (EPSS)

Low risk
0.20%

10th percentile - higher than 10% of all known CVEs

Summary

Stored Cross-Site Scripting (XSS) vulnerability in the MW WP Form plugin for WordPress up to version 5.1.3. The issue is due to insufficient input sanitization and output escaping in the 'memo' parameter. Authenticated attackers with editor-level access and above can inject arbitrary scripts, and WordPress's built-in kses and unfiltered_html protections do not apply because data is stored via update_post_meta().

Risk Assessment

Attackers can inject malicious scripts that execute in users' browsers when visiting infected pages, potentially leading to data theft or session hijacking. Attackers can also break out of the textarea element via injected closing tags.

Recommendation

Update the MW WP Form plugin to the latest version and follow secure coding practices, including proper data sanitization.

Related vulnerabilities

Original NVD description (English source)

The MW WP Form plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'memo' parameter in all versions up to, and including, 5.1.3 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with editor-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. Because the memo value is stored via update_post_meta() rather than wp_insert_post(), WordPress's built-in kses and unfiltered_html protections do not apply, allowing attackers to break out of the textarea element via injected closing tags regardless of role-based content filtering.

Vulnerability data from NVD (NIST) · CISA KEV · EPSS