WordPress 4.0.17
WordPress 4.0.17 has 121 disclosed vulnerabilities in the WordSec catalog, reported between 2012 and 2025; all 121 are fixed as of August 2026. Their average CVSS score is 6.3, and the most serious one scores 9.8 out of 10. Severity breakdown: 5 critical and 26 high. 2020 was the busiest year with 22 disclosures.
The most common weakness is Cross-Site Scripting, behind 48 of the records (40%). Other recurring categories include Improper Authorization, Cross-Site Request Forgery (CSRF).
Every one of the 121 issues recorded for WordPress 4.0.17 has a vendor fix available, so running the current release closes all known holes.
67 independent researchers contributed these findings, most of them (10) reported by Simon Scannell.
WordPress Core < 6.0.3 - SQL Injection via WP_Date_Query
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