HomeWordPress vulnerabilitiesPost SMTP
Post SMTP vulnerabilities
Post SMTP has 21 known vulnerabilities in this database. The most recent published record is dated 6 Oct 2026.
- Known vulnerabilities
- 21
- Active installs
- 300,000+
- Latest version
- 4.0.2
- Last updated
- 24 Sep 2026
- Most recent
- 6 Oct 2026
Find it in your WordPress dashboard under Plugins. Severity is based on the CVSS score published with the CVE where one is available.
| Vulnerability | Severity | Affected | Fix | Published |
|---|---|---|---|---|
| Cross-site scripting (XSS) CVE-2026-75962 | High 7.2 | Up to 4.0.1 | Fixed in a later version (latest 4.0.2) | 1 d ago |
| Cross-site scripting (XSS) CVE-2026-3090 | High 7.2 | Up to 3.8.0 | Fixed in a later version (latest 4.0.2) | 18 Mar 2026 |
| Broken access control CVE-2026-2559 | Medium 5.3 | Up to 3.8.0 | Fixed in a later version (latest 4.0.2) | 18 Mar 2026 |
| Broken access control CVE-2025-12887 | Medium 5.4 | Up to 3.6.1 | Fixed in a later version (latest 4.0.2) | 3 Dec 2025 |
| Authentication bypass CVE-2025-11833 | Critical 9.8 | Up to 3.6.0 | Fixed in a later version (latest 4.0.2) | 1 Nov 2025 |
| Broken access control CVE-2025-9219 | Medium 4.3 | Up to 3.4.1 | Fixed in a later version (latest 4.0.2) | 3 Sep 2025 |
| SQL injection CVE-2024-13844 | Medium 4.9 | Before 3.1.3 | Fixed in 3.1.3 | 8 Mar 2025 |
| Cross-site scripting (XSS) CVE-2025-0521 | High 7.2 | Before 3.1.0 | Fixed in 3.1.0 | 18 Feb 2025 |
| SQL injection CVE-2024-5207 | High 7.2 | Before 2.9.4 | Fixed in 2.9.4 | 30 May 2024 |
| Cross-site request forgery (CSRF) CVE-2023-3178 | Medium 4.3 | Before 2.5.7 | Fixed in 2.5.7 | 16 Jan 2024 |
| SQL injection CVE-2023-6620 | High 7.2 | Before 2.8.7 | Fixed in 2.8.7 | 15 Jan 2024 |
| Broken access control CVE-2023-6875 | Critical 9.8 | Up to 2.8.7 | Fixed in a later version (latest 4.0.2) | 11 Jan 2024 |
| Cross-site scripting (XSS) CVE-2023-6621 | Medium 6.1 | Before 2.8.7 | Fixed in 2.8.7 | 3 Jan 2024 |
| Cross-site scripting (XSS) CVE-2023-6629 | Medium 6.1 | Before 2.8.7 | Fixed in 2.8.7 | 3 Jan 2024 |
| Cross-site scripting (XSS) CVE-2023-7027 | High 7.2 | Before 2.8.8 | Fixed in 2.8.8 | 3 Jan 2024 |
| Cross-site scripting (XSS) CVE-2023-5958 | Medium 6.1 | Before 2.7.1 | Fixed in 2.7.1 | 27 Nov 2023 |
| Cross-site request forgery (CSRF) CVE-2023-3179 | High 8.8 | Before 2.5.7 | Fixed in 2.5.7 | 17 Jul 2023 |
| Cross-site request forgery (CSRF) CVE-2021-4422 | Medium 4.3 | Up to 2.0.20 | Fixed in a later version (latest 4.0.2) | 12 Jul 2023 |
| Cross-site scripting (XSS) CVE-2023-3082 | High 7.2 | Before 2.5.8 | Fixed in 2.5.8 | 12 Jul 2023 |
| Server-side request forgery (SSRF) CVE-2022-2352 | High 7.2 | Before 2.1.7 | Fixed in 2.1.7 | 26 Sep 2022 |
| Cross-site scripting (XSS) CVE-2022-2351 | Medium 4.8 | Before 2.1.4 | Fixed in 2.1.4 | 16 Sep 2022 |
Read the published descriptions
- CVE-2026-75962, 6 Oct 2026
- The Post SMTP - Complete Email Deliverability and SMTP Solution with Email Logs, Alerts, Backup SMTP & Mobile App plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'user_email' parameter in all versions up to, and including, 4.0.1 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. This is exploitable without authentication on WordPress Multisite installations with public registration enabled, as WordPress accepts email addresses containing numeric HTML character references that Post SMTP's stricter validator rejects, persisting the attacker-controlled address verbatim to the email log via the failed-send exception message. CVE record
- CVE-2026-3090, 18 Mar 2026
- The Post SMTP - Complete Email Deliverability and SMTP Solution with Email Logs, Alerts, Backup SMTP & Mobile App plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the ‘event_type’ parameter in all versions up to, and including, 3.8.0 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. The vulnerability is only exploitable when the Post SMTP Pro plugin is also installed and its Reporting and Tracking extension is enabled. CVE record
- CVE-2026-2559, 18 Mar 2026
- The Post SMTP plugin for WordPress is vulnerable to unauthorized modification of data due to a missing capability check on the `handle_office365_oauth_redirect()` function in all versions up to, and including, 3.8.0. This is due to the function being hooked to `admin_init` without any `current_user_can()` check or nonce verification. This makes it possible for authenticated attackers, with Subscriber-level access and above, to overwrite the site's Office 365 OAuth mail configuration (access token, refresh token, and user email) via a crafted URL. The configuration option is used during wizard setup of Microsoft365 SMTP, only available in the Pro option of the plugin. This could cause an Administrator to believe an attacker-controlled Azure app is their own, and lead them to connect the plugin to the attacker's account during configuration after upgrading to Pro. CVE record
- CVE-2025-12887, 3 Dec 2025
- The Post SMTP plugin for WordPress is vulnerable to authorization bypass in all versions up to, and including, 3.6.1. This is due to the plugin not properly verifying that a user is authorized to update OAuth tokens on the 'handle_gmail_oauth_redirect' function. This makes it possible for authenticated attackers, with subscriber level access and above, to inject invalid or attacker-controlled OAuth credentials. CVE-2025-67563 appears to be a duplicate of this issue. CVE record
- CVE-2025-11833, 1 Nov 2025
- The Post SMTP - Complete SMTP Solution with Logs, Alerts, Backup SMTP & Mobile App plugin for WordPress is vulnerable to unauthorized access of data due to a missing capability check on the __construct function in all versions up to, and including, 3.6.0. This makes it possible for unauthenticated attackers to read arbitrary logged emails sent through the Post SMTP plugin, including password reset emails containing password reset links, which can lead to account takeover. CVE record
- CVE-2025-9219, 3 Sep 2025
- The Post SMTP - WP SMTP Plugin with Email Logs and Mobile App for Failure Notifications - Gmail SMTP, Office 365, Brevo, Mailgun, Amazon SES and more plugin for WordPress is vulnerable to unauthorized modification of data due to a missing capability check on the 'update_post_smtp_pro_option_callback' function in all versions up to, and including, 3.4.1. This makes it possible for authenticated attackers, with Subscriber-level access and above, to enable pro extensions. CVE record
- CVE-2024-13844, 8 Mar 2025
- The Post SMTP plugin for WordPress is vulnerable to generic SQL Injection via the ‘columns’ parameter in all versions up to, and including, 3.1.2 due to insufficient escaping on the user supplied parameter and lack of sufficient preparation on the existing SQL query. This makes it possible for authenticated attackers, with Administrator-level access and above, to append additional SQL queries into already existing queries that can be used to extract sensitive information from the database. CVE record
- CVE-2025-0521, 18 Feb 2025
- The Post SMTP plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the from and subject parameter in all versions up to, and including, 3.0.2 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. CVE record
- CVE-2024-5207, 30 May 2024
- The POST SMTP - The #1 WordPress SMTP Plugin with Advanced Email Logging and Delivery Failure Notifications plugin for WordPress is vulnerable to time-based SQL Injection via the selected parameter in all versions up to, and including, 2.9.3 due to insufficient escaping on the user supplied parameter and lack of sufficient preparation on the existing SQL query. This makes it possible for authenticated attackers with administrator access or higher to append additional SQL queries into already existing queries that can be used to extract sensitive information from the database. CVE record
- CVE-2023-3178, 16 Jan 2024
- The POST SMTP Mailer WordPress plugin before 2.5.7 does not have proper CSRF checks in some AJAX actions, which could allow attackers to make logged in users with the manage_postman_smtp capability delete arbitrary logs via a CSRF attack. CVE record
- CVE-2023-6620, 15 Jan 2024
- The POST SMTP Mailer WordPress plugin before 2.8.7 does not properly sanitise and escape several parameters before using them in SQL statements, leading to a SQL injection exploitable by high privilege users such as admin. CVE record
- CVE-2023-6875, 11 Jan 2024
- The POST SMTP Mailer - Email log, Delivery Failure Notifications and Best Mail SMTP for WordPress plugin for WordPress is vulnerable to unauthorized access of data and modification of data due to a type juggling issue on the connect-app REST endpoint in all versions up to, and including, 2.8.7. This makes it possible for unauthenticated attackers to reset the API key used to authenticate to the mailer and view logs, including password reset emails, allowing site takeover. CVE-2023-52233 appears to be a duplicate of this issue. CVE record
- CVE-2023-6621, 3 Jan 2024
- The POST SMTP WordPress plugin before 2.8.7 does not sanitise and escape the msg parameter before outputting it back in the page, leading to a Reflected Cross-Site Scripting which could be used against high privilege users such as admin. CVE record
- CVE-2023-6629, 3 Jan 2024
- The POST SMTP Mailer - Email log, Delivery Failure Notifications and Best Mail SMTP for WordPress plugin for WordPress is vulnerable to Reflected Cross-Site Scripting via the ‘msg’ parameter in all versions up to, and including, 2.8.6 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that execute if they can successfully trick a user into performing an action such as clicking on a link. CVE-2023-6621 appears to be a duplicate of this issue. CVE-2024-29128 appears to be a duplicate of this issue. CVE record
- CVE-2023-7027, 3 Jan 2024
- The POST SMTP Mailer - Email log, Delivery Failure Notifications and Best Mail SMTP for WordPress plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the ‘device’ header in all versions up to, and including, 2.8.7 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. CVE record
- CVE-2023-5958, 27 Nov 2023
- The POST SMTP Mailer WordPress plugin before 2.7.1 does not escape email message content before displaying it in the backend, allowing an unauthenticated attacker to perform XSS attacks against highly privileged users. CVE record
- CVE-2023-3179, 17 Jul 2023
- The POST SMTP Mailer WordPress plugin before 2.5.7 does not have proper CSRF checks in some AJAX actions, which could allow attackers to make logged in users with the manage_postman_smtp capability resend an email to an arbitrary address (for example a password reset email could be resent to an attacker controlled email, and allow them to take over an account). CVE record
- CVE-2021-4422, 12 Jul 2023
- The POST SMTP Mailer plugin for WordPress is vulnerable to Cross-Site Request Forgery in versions up to, and including, 2.0.20. This is due to missing or incorrect nonce validation on the handleCsvExport() function. This makes it possible for unauthenticated attackers to trigger a CSV export via a forged request granted they can trick a site administrator into performing an action such as clicking on a link. CVE record
- CVE-2023-3082, 12 Jul 2023
- The Post SMTP plugin for WordPress is vulnerable to Stored Cross-Site Scripting via email contents in versions up to, and including, 2.5.7 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. CVE record
- CVE-2022-2352, 26 Sep 2022
- The Post SMTP Mailer/Email Log WordPress plugin before 2.1.7 does not have proper authorisation in some AJAX actions, which could allow high privilege users such as admin to perform blind SSRF on multisite installations for example. CVE record
- CVE-2022-2351, 16 Sep 2022
- The Post SMTP Mailer/Email Log WordPress plugin before 2.1.4 does not escape some of its settings before outputting them in the admins dashboard, allowing high privilege users to perform Cross-Site Scripting attacks against other users even when the unfiltered_html capability is disallowed. CVE record
What to do if you run Post SMTP
If you run Post SMTP, open WordPress and check the installed version in Plugins. Compare it with the affected versions in the vulnerability record. If a fixed version is available, take a current backup and update to that version or the latest supported release.
If no fixed version exists, consider disabling and removing the plugin or replacing it with a maintained alternative. After dealing with the affected software, check administrator users, unexpected file changes, redirects, unfamiliar pages and security logs for signs that the site may already have been altered.
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