Post SMTP – Complete Email Delivery and SMTP Solution with Email Logs, Alerts, Backup SMTP & Mobile App vulnerabilities
Plugin slug post-smtp · 28 known vulnerabilities · latest disclosed 2026-10-05 · WordPress.org page
Every listed vulnerability has a fix. Version 4.0.2 or later is not affected by any of them. If your site runs an older version, update it.
13 of 28 rated high or critical (CVSS 7 or more).
Known vulnerabilities in Post SMTP – Complete Email Delivery and SMTP Solution with Email Logs, Alerts, Backup SMTP & Mobile App
| Severity | Affected versions | Fixed in | CVE | Published | Details |
|---|---|---|---|---|---|
| High 7.2 | <= 4.0.1 | 4.0.2 | CVE-2026-75962 | 2026-10-05 | Advisory |
| Medium 6.3 | 4.0.0-beta.1 | 4.0.1 | CVE-2026-81278 | 2026-08-26 | Advisory |
| High 7.2 | <= 3.6.2 | 3.6.3 | CVE-2026-48838 | 2026-05-28 | Advisory |
| Medium 6.1 | <= 3.0.0 | 3.1.0 | CVE-2024-13362 | 2026-04-30 | Advisory |
| Medium 5.3 | <= 3.8.0 | 3.9.0 | CVE-2026-2559 | 2026-03-17 | Advisory |
| High 7.2 | <= 3.8.0 | 3.9.0 | CVE-2026-3090 | 2026-03-17 | Advisory |
| Medium 5.4 | <= 3.6.1 | 3.6.2 | CVE-2025-12887 | 2025-12-03 | Advisory |
| Critical 9.8 | <= 3.6.0 | 3.6.1 | CVE-2025-11833 | 2025-10-31 | Advisory |
| Medium 4.3 | <= 3.4.1 | 3.4.2 | CVE-2025-9219 | 2025-09-02 | Advisory |
| High 8.8 | <= 3.2.0 | 3.3.0 | CVE-2025-24000 | 2025-07-21 | Advisory |
| Medium 4.9 | <= 3.1.2 | 3.1.3 | CVE-2024-13844 | 2025-03-07 | Advisory |
| High 7.2 | <= 3.0.2 | 3.1.0 | CVE-2025-0521 | 2025-02-17 | Advisory |
| Medium 4.3 | <= 2.9.11 | 2.9.12 | CVE-2025-22800 | 2025-01-07 | Advisory |
| Medium 4.9 | <= 2.9.9 | 2.9.10 | CVE-2024-52436 | 2024-11-15 | Advisory |
| High 7.2 | <= 2.9.3 | 2.9.4 | CVE-2024-5207 | 2024-05-22 | Advisory |
| Critical 9.8 | <= 2.8.7 | 2.8.8 | CVE-2023-6875 | 2024-01-10 | Advisory |
| Medium 6.1 | <= 2.8.6 | 2.8.7 | CVE-2023-6629 | 2024-01-02 | Advisory |
| High 7.2 | <= 2.8.7 | 2.8.8 | CVE-2023-7027 | 2024-01-02 | Advisory |
| High 7.2 | <= 2.8.6 | 2.8.7 | CVE-2023-6620 | 2023-12-21 | Advisory |
| High 7.2 | <= 2.7.0 | 2.7.1 | CVE-2023-5958 | 2023-11-06 | Advisory |
| High 7.2 | < 2.6.1 | 2.6.1 | none | 2023-10-03 | Advisory |
| Medium 6.1 | 2.1.2-beta.1 to 2.5.7 | 2.5.9-beta.1 | CVE-2023-33999 | 2023-07-18 | Advisory |
| High 7.2 | <= 2.5.7 | 2.5.8 | CVE-2023-3082 | 2023-07-11 | Advisory |
| Medium 6.5 | <= 2.5.6 | 2.5.7 | CVE-2023-3179 | 2023-06-26 | Advisory |
| Medium 4.3 | <= 2.5.6 | 2.5.7 | CVE-2023-3178 | 2023-06-26 | Advisory |
| Medium 6.6 | <= 2.1.6 | 2.1.7 | CVE-2022-2352 | 2022-09-05 | Advisory |
| Medium 5.5 | <= 2.1.3 | 2.1.4 | CVE-2022-2351 | 2022-08-18 | Advisory |
| Medium 4.3 | <= 2.0.20 | 2.0.21 | CVE-2021-4422 | 2021-03-01 | Advisory |
Check if a site is affected
Enter a site address to see which version of Post SMTP – Complete Email Delivery and SMTP Solution with Email Logs, Alerts, Backup SMTP & Mobile App and other plugins it runs, and whether they match a known vulnerability.
Questions
Is the Post SMTP – Complete Email Delivery and SMTP Solution with Email Logs, Alerts, Backup SMTP & Mobile App plugin safe to use?
All 28 known issues are fixed in current versions (4.0.2 or later). Keeping it updated is what matters.
How do I check which version of Post SMTP – Complete Email Delivery and SMTP Solution with Email Logs, Alerts, Backup SMTP & Mobile App my site runs?
In WordPress go to Plugins > Installed Plugins. From the outside, the free PluginPeek scan below reads the version from the site's public files.
How do I fix a vulnerable plugin?
Make a full backup, then update it from Dashboard > Updates and check the site afterwards. If you would rather not, we can do it for a fixed $99, paid after you have checked the site.