HomeWordPress vulnerabilitiesWP Mailster
WP Mailster vulnerabilities
WP Mailster has 4 known vulnerabilities in this database. The most recent published record is dated 6 Oct 2026.
- Known vulnerabilities
- 4
- Active installs
- 300+
- Latest version
- 1.9.0.0
- Last updated
- 20 Sep 2026
- Most recent
- 6 Oct 2026
No fixed version has been published yet, so consider disabling, removing or replacing the plugin until a safe release is available.
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-2026-105061 | High 7.1 | Up to 1.9.0.0 | No fixed version yet | 1 d ago |
| Broken access control CVE-2026-105055 | Medium 5.3 | Up to 1.9.0.0 | No fixed version yet | 2 d ago |
| Cross-site scripting (XSS) CVE-2024-11782 | Medium 6.4 | Before 1.8.18 | Fixed in 1.8.18 | 3 Dec 2024 |
| Cross-site scripting (XSS) CVE-2017-17451 | Medium 6.1 | Before 1.5.5 | Fixed in 1.5.5 | 7 Dec 2017 |
Read the published descriptions
- CVE-2026-105061, 6 Oct 2026
- Unauthenticated Cross Site Scripting (XSS) in WP Mailster <= 1.9.0.0 versions. CVE record
- CVE-2026-105055, 5 Oct 2026
- Missing Authorization vulnerability in WP Mailster WP Mailster wp-mailster allows Exploiting Incorrectly Configured Access Control Security Levels.This issue affects WP Mailster: from n/a through 1.9.0.0. CVE record
- CVE-2024-11782, 3 Dec 2024
- The WP Mailster plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the plugin's 'mst_subscribe' shortcode in all versions up to, and including, 1.8.17.0 due to insufficient input sanitization and output escaping on user supplied attributes. This makes it possible for authenticated attackers, with contributor-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. CVE record
- CVE-2017-17451, 7 Dec 2017
- The WP Mailster plugin before 1.5.5 for WordPress has XSS in the unsubscribe handler via the mes parameter to view/subscription/unsubscribe2.php. CVE record
What to do if you run WP Mailster
If you run WP Mailster, 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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