Mailchimp Subscribe Form Optin Builder Popup Builder Form Builder
Monthly
Stored Cross-Site Scripting in the MailChimp Subscribe Form, Optin Builder, PopUp Builder, Form Builder WordPress plugin (all versions through 4.3.3) allows unauthenticated network attackers to plant arbitrary JavaScript via form field values submitted to the plugin's form endpoints. The payload is persisted to the database and fires in any authenticated or unauthenticated user's browser upon visiting the injected page, with scope change confirmed by CVSS S:C. No active exploitation has been confirmed by CISA KEV, but Wordfence's disclosure includes direct references to the vulnerable source lines, effectively providing a functional roadmap to exploitation. The EPSS probability is not provided in the source data.
Stored Cross-Site Scripting in the MailChimp Subscribe Form, Optin Builder, PopUp Builder, Form Builder WordPress plugin (all versions through 4.3.3) allows unauthenticated network attackers to plant arbitrary JavaScript via form field values submitted to the plugin's form endpoints. The payload is persisted to the database and fires in any authenticated or unauthenticated user's browser upon visiting the injected page, with scope change confirmed by CVSS S:C. No active exploitation has been confirmed by CISA KEV, but Wordfence's disclosure includes direct references to the vulnerable source lines, effectively providing a functional roadmap to exploitation. The EPSS probability is not provided in the source data.