The GNU-Mailman Integration WordPress plugin is vulnerable to Reflected Cross-Site Scripting via the gm_error parameter found in the ~/includes/admin/mailing-lists-page.php file which allows attackers to inject arbitrary web scripts, in versions up to and including 1.0.6.
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Check my exposure →This product uses data from the NVD API but is not endorsed or certified by the NVD. Informational only; not professional security advice.