{"description":"Trending threats, MITRE ATT\u0026CK coverage, and detection metadata. Fed continuously.","feed_url":"https://feed.craftedsignal.io/products/mailchimp-forms-by-mailmunch/feed.json","home_page_url":"https://feed.craftedsignal.io/","items":[{"_cs_actors":[],"_cs_cpes":[],"_cs_cves":[{"cvss":8.1,"id":"CVE-2026-7520"}],"_cs_exploited":false,"_cs_has_poc":false,"_cs_poc_references":[],"_cs_products":["MailChimp Forms by MailMunch"],"_cs_severities":["high"],"_cs_tags":[],"_cs_type":"advisory","_cs_vendors":["MailMunch"],"content_html":"\u003cp\u003eThe MailChimp Forms by MailMunch plugin for WordPress (versions 3.2.7 and earlier) is susceptible to a vulnerability arising from missing capability checks within its \u003ccode\u003esign_in()\u003c/code\u003e and \u003ccode\u003esign_up()\u003c/code\u003e AJAX handlers. This flaw permits authenticated users, including those with restricted 'Subscriber' permissions, to interact with administrative functions meant only for higher-privileged users. By invoking these handlers with malicious parameters, an attacker can overwrite the site's legitimate MailMunch integration settings with credentials for an account they control.\u003c/p\u003e\n\u003cp\u003eThe impact of this vulnerability is significant, as it effectively grants the attacker control over the data pipeline. Once the integration is hijacked, any personal identifiable information (PII) captured through the plugin's forms is sent directly to the attacker's external account. Furthermore, the attacker can force the WordPress site to render malicious forms or landing pages hosted within their own MailMunch environment, potentially facilitating further phishing or credential harvesting campaigns against site visitors.\u003c/p\u003e\n\u003ch2 id=\"attack-chain\"\u003eAttack Chain\u003c/h2\u003e\n\u003col\u003e\n\u003cli\u003eAttacker obtains valid low-privileged credentials (Subscriber level) on the target WordPress site via brute force or credential stuffing.\u003c/li\u003e\n\u003cli\u003eAttacker logs into the WordPress site to establish an authenticated session.\u003c/li\u003e\n\u003cli\u003eAttacker identifies the WordPress site is using the 'MailChimp Forms by MailMunch' plugin.\u003c/li\u003e\n\u003cli\u003eAttacker performs an HTTP POST request to the \u003ccode\u003eadmin-ajax.php\u003c/code\u003e endpoint associated with the \u003ccode\u003esign_in()\u003c/code\u003e or \u003ccode\u003esign_up()\u003c/code\u003e plugin functions.\u003c/li\u003e\n\u003cli\u003eThe server fails to validate the user's role/capability, allowing the request to proceed.\u003c/li\u003e\n\u003cli\u003eThe plugin updates its internal database configuration with the attacker's provided API keys or credentials.\u003c/li\u003e\n\u003cli\u003eCaptured form data from legitimate site visitors is redirected to the attacker's exfiltration point.\u003c/li\u003e\n\u003cli\u003eAttacker leverages the compromised plugin interface to inject malicious landing pages for social engineering.\u003c/li\u003e\n\u003c/ol\u003e\n\u003ch2 id=\"impact\"\u003eImpact\u003c/h2\u003e\n\u003cp\u003eSuccessful exploitation results in the unauthorized exfiltration of all subscriber PII collected via the plugin's forms and the potential delivery of malicious content to end-users. The plugin is widely used in small-to-medium enterprise (SME) websites; the scale of potential impact spans any site using the vulnerable 3.2.7 or earlier versions. Data theft can lead to direct regulatory compliance violations and reputational damage.\u003c/p\u003e\n\u003ch2 id=\"recommendation\"\u003eRecommendation\u003c/h2\u003e\n\u003cp\u003ePrioritized actions for security teams:\u003c/p\u003e\n\u003cul\u003e\n\u003cli\u003eUpdate the 'MailChimp Forms by MailMunch' plugin to the latest version immediately to remediate the missing capability checks.\u003c/li\u003e\n\u003cli\u003eAudit WordPress user accounts for suspicious 'Subscriber' or lower-privileged account creation dates to identify potential initial access.\u003c/li\u003e\n\u003cli\u003eReview web server access logs for anomalous \u003ccode\u003ePOST\u003c/code\u003e requests to \u003ccode\u003ewp-admin/admin-ajax.php\u003c/code\u003e involving the MailMunch plugin strings.\u003c/li\u003e\n\u003cli\u003eEnsure administrative access to the WordPress dashboard is protected by Multi-Factor Authentication (MFA) to prevent unauthorized entry of low-privileged accounts.\u003c/li\u003e\n\u003c/ul\u003e\n","date_modified":"2026-08-05T09:18:16Z","date_published":"2026-08-05T09:18:16Z","id":"https://feed.craftedsignal.io/briefs/2026-08-mailmunch-plugin-vulnerability/","summary":"An authentication vulnerability in the MailChimp Forms by MailMunch WordPress plugin allows authenticated users to relink site integrations, resulting in unauthorized data exfiltration and content modification.","title":"CVE-2026-7520 - Unauthorized Data Redirection in MailChimp Forms by MailMunch","url":"https://feed.craftedsignal.io/briefs/2026-08-mailmunch-plugin-vulnerability/"}],"language":"en","title":"CraftedSignal Threat Feed - MailChimp Forms by MailMunch","version":"https://jsonfeed.org/version/1.1"}