HomeWordPress vulnerabilitiesNinjaFirewall (WP Edition)
NinjaFirewall (WP Edition) vulnerabilities
NinjaFirewall (WP Edition) has 1 known vulnerability in this database. The most recent published record is dated 16 Oct 2024.
- Known vulnerabilities
- 1
- Active installs
- 100,000+
- Latest version
- 4.9.1
- Last updated
- 22 Sep 2026
- Most recent
- 16 Oct 2024
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 |
|---|---|---|---|---|
| PHP object injection CVE-2021-4451 | Medium 6.6 | Up to 4.3.3 | Fixed in a later version (latest 4.9.1) | 16 Oct 2024 |
Read the published descriptions
- CVE-2021-4451, 16 Oct 2024
- The NinjaFirewall plugin for WordPress is vulnerable to Authenticated PHAR Deserialization in versions up to, and including, 4.3.3. This allows authenticated attackers to perform phar deserialization on the server. This deserialization can allow other plugin or theme exploits if vulnerable software is present (WordPress, and NinjaFirewall). CVE record
What to do if you run NinjaFirewall (WP Edition)
If you run NinjaFirewall (WP Edition), 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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