vulnerability
WordPress Plugin: ninjafirewall: CVE-2021-4451: Deserialization of Untrusted Data
| Severity | CVSS | Published | Added | Modified |
|---|---|---|---|---|
| 8 | (AV:N/AC:M/Au:M/C:C/I:C/A:C) | May 30, 2021 | May 15, 2025 | Apr 30, 2026 |
Severity
8
CVSS
(AV:N/AC:M/Au:M/C:C/I:C/A:C)
Published
May 30, 2021
Added
May 15, 2025
Modified
Apr 30, 2026
Description
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).
Solution
ninjafirewall-plugin-cve-2021-4451
References
Rapid7 Labs
2026 Global Threat Landscape Report
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