WordPress plugin
Custom 404 Pro security & vulnerabilities
No known unpatched vulnerabilities in the latest version
All 12 known vulnerabilities are fixed in the latest release. If you run an older version, update to null or newer.
- Critical2
- High2
- Medium8
- Low0
All Custom 404 Pro vulnerabilities
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Custom 404 Pro: common questions
Does Custom 404 Pro have known vulnerabilities?
Yes. VulnCrest Radar lists 12 known vulnerabilities in Custom 404 Pro: 2 critical, 2 high, 8 medium. None are known to affect version null.
How do I check which version of Custom 404 Pro I run?
In wp-admin open Plugins → Installed Plugins; the version is shown under the name. Without admin access, our passive Check my site tool can often read it from public files.
What is the most recent Custom 404 Pro vulnerability?
CVE-2025-9947, published Oct 10, 2025: Custom 404 Pro <= 3.12.0 - Authenticated (Administrator+) SQL Injection via `path` Parameter. Severity: Medium (CVSS 4.9).
Is any Custom 404 Pro vulnerability listed in CISA KEV?
No. None of the known Custom 404 Pro vulnerabilities is currently listed in the CISA KEV catalog.