{"id":214624,"date":"2026-03-18T06:34:14","date_gmt":"2026-03-18T06:34:14","guid":{"rendered":"https:\/\/postmansmtp.com\/?p=214624"},"modified":"2026-03-18T06:34:20","modified_gmt":"2026-03-18T06:34:20","slug":"post-smtp-3-9-0-security-update","status":"publish","type":"post","link":"https:\/\/postmansmtp.com\/es\/post-smtp-3-9-0-security-update\/","title":{"rendered":"Version 3.9.0 Security Update: Important Fixes Released \u2013 Please Update"},"content":{"rendered":"\n<p>At Post SMTP, security and reliable email delivery are always our top priorities. The plugin powers email delivery for 300,000+ WordPress websites, so maintaining strong protection and stability is something we take very seriously.<\/p>\n\n\n\n<p>Recently, the Wordfence security team reported two vulnerabilities. After reviewing the report, our development team quickly investigated the issue and released <strong>Post SMTP Free 3.9.0 and Post SMTP Pro 1.5.1<\/strong> to address them.<\/p>\n\n\n\n<p>These updates include important security patches that strengthen the plugin and help keep your WordPress site protected.<\/p>\n\n\n\n<p>We strongly recommend updating to the latest version as soon as possible.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Security Patches Included in This Release<\/strong><\/h2>\n\n\n\n<p>The latest update includes <strong>two security fixes<\/strong> that improve the plugin\u2019s protection and access controls.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Fix 1: Stored XSS Vulnerability Patch<\/strong><\/h3>\n\n\n\n<p>A vulnerability was identified in versions up to <strong>3.8.0<\/strong> that could allow malicious scripts to be stored through certain tracking requests.<\/p>\n\n\n\n<p>If exploited, the injected script could run when an administrator viewed the Email Logs page inside the WordPress dashboard.<\/p>\n\n\n\n<p>While this required specific conditions, it could potentially lead to unauthorized actions within the admin area.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\"><strong>What We Fixed<\/strong><\/h4>\n\n\n\n<p>Our team implemented additional safeguards to prevent this scenario by:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Improving how user input is processed and validated<\/li>\n\n\n\n<li>Adding stronger output protection when displaying log data<\/li>\n\n\n\n<li>Making sure that email tracking requests are handled so that only safe and validated data can be stored in the logs.<\/li>\n<\/ul>\n\n\n\n<p>These changes ensure that email tracking data is handled safely and cannot be used to inject malicious content.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Fix 2: Unauthorized Configuration Change Prevention<\/strong><\/h3>\n\n\n\n<p>A second issue involved the OAuth connection process used when setting up Microsoft 365 email authentication.<\/p>\n\n\n\n<p>Under certain conditions, a logged-in user with limited permissions could attempt to manipulate the configuration flow.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\"><strong>What We Fixed<\/strong><\/h4>\n\n\n\n<p>To resolve this issue, we improved the verification process by:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Adding stronger permission checks for sensitive actions<\/li>\n\n\n\n<li>Introducing additional security validation during the authentication process<\/li>\n\n\n\n<li>Restricting configuration changes to authorized administrators only<\/li>\n<\/ul>\n\n\n\n<p>These improvements ensure that only trusted users can manage or modify email service connections.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Our Commitment to Security<\/strong><\/h2>\n\n\n\n<p>Security researchers and responsible disclosure programs play a critical role in keeping the WordPress ecosystem safe.<\/p>\n\n\n\n<p>We would like to thank Wordfence and their security research team for responsibly reporting these issues and helping us strengthen Post SMTP.<\/p>\n\n\n\n<p>Our development team responded quickly to investigate, patch the vulnerabilities, and release a secure update for the community.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Update Post SMTP Today<\/strong><\/h2>\n\n\n\n<p>To keep your website protected, we strongly recommend updating your plugin immediately:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Post SMTP Free \u2192 Version 3.9.0<\/strong><\/li>\n\n\n\n<li><strong>Post SMTP Pro \u2192 Version 1.5.1<\/strong><\/li>\n<\/ul>\n\n\n\n<p>Updating ensures you receive the latest security improvements and continue sending WordPress emails safely and reliably.<\/p>\n\n\n\n<p>Go to your <strong>WordPress Dashboard \u2192 Plugins \u2192 Update Now<\/strong> to install the latest version.<\/p>\n\n\n\n<p>Thank you for trusting <mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-ast-global-color-0-color\"><a href=\"https:\/\/postmansmtp.com\/pricing\/\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>Post SMTP<\/strong><\/a> <\/mark>to power your WordPress email delivery.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>At Post SMTP, security and reliable email delivery are always our top [&hellip;]<\/p>\n","protected":false},"author":6276,"featured_media":214673,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_seopress_robots_primary_cat":"none","_seopress_titles_title":"Post SMTP 3.9.0 Security Update: Please Update the Plugin","_seopress_titles_desc":"Post SMTP 3.9.0 and Pro 1.5.1 fix security patches for vulnerabilities reported by Wordfence. 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