Open-Source CMS Security Landscape in 2026: Vulnerabilities, Patches, and Best Practices
As we publish this in April 2026, open-source CMS platforms power the majority of the web—from small business blogs to enterprise portals. But with great popularity comes an equally massive attack surface. Last year’s supply-chain security post highlighted how third-party components (plugins, themes, libraries) have become the weakest link in modern web infrastructure. Fast-forward to 2026, and those warnings have materialized even more clearly: the OWASP Top 10:2025 now ranks Software Supply Chain Failures (A03) as the third-most critical risk, directly expanding the 2021 category of “Vulnerable and Outdated Components.” The numbers don’t lie. WordPress alone recorded 11,334 new vulnerabilities in 2025 —a 42% jump from 2024—with 91% originating in plugins and just 6 low-priority issues in core. Drupal, by contrast, continues to earn praise for robust core security and stricter contribution standards. Joomla sits in the middle, while headless architectures shift the battleground to A...