Hummingbird Performance – Cache & Page Speed Optimization for Core Web Vitals | Critical CSS | Minify CSS | Defer CSS Javascript | CDN vulnerabilities
Plugin slug hummingbird-performance · 9 known vulnerabilities · latest disclosed 2026-11-07 · WordPress.org page
Every listed vulnerability has a fix. Version 4.0.0 or later is not affected by any of them. If your site runs an older version, update it.
3 of 9 rated high or critical (CVSS 7 or more).
Known vulnerabilities in Hummingbird Performance – Cache & Page Speed Optimization for Core Web Vitals | Critical CSS | Minify CSS | Defer CSS Javascript | CDN
| Severity | Affected versions | Fixed in | CVE | Published | Details |
|---|---|---|---|---|---|
| Medium 6.4 | <= 3.21.2 | 4.0.0 | CVE-2026-121763 | 2026-11-07 | Advisory |
| Critical 9.8 | <= 3.21.0 | 3.21.1 | CVE-2026-83627 | 2026-09-04 | Advisory |
| High 7.2 | < 3.21.2 | 3.21.2 | CVE-2026-19224 | 2026-09-04 | Advisory |
| High 7.5 | <= 3.18.0 | 3.18.1 | CVE-2025-14437 | 2025-12-17 | Advisory |
| Medium 4.3 | <= 3.9.1 | 3.9.2 | CVE-2024-43117 | 2024-08-07 | Advisory |
| Medium 4.3 | <= 3.9.1 | 3.9.2 | CVE-2024-43118 | 2024-08-07 | Advisory |
| Medium 5.3 | <= 3.7.3 | 3.7.4 | CVE-2024-32792 | 2024-04-22 | Advisory |
| Medium 5.3 | <= 3.4.1 | 3.4.2 | CVE-2023-1478 | 2023-03-20 | Advisory |
| Medium 5.5 | < 3.3.2 | 3.3.2 | CVE-2022-0994 | 2022-03-23 | Advisory |
Check if a site is affected
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Questions
Is the Hummingbird Performance – Cache & Page Speed Optimization for Core Web Vitals | Critical CSS | Minify CSS | Defer CSS Javascript | CDN plugin safe to use?
All 9 known issues are fixed in current versions (4.0.0 or later). Keeping it updated is what matters.
How do I check which version of Hummingbird Performance – Cache & Page Speed Optimization for Core Web Vitals | Critical CSS | Minify CSS | Defer CSS Javascript | CDN my site runs?
In WordPress go to Plugins > Installed Plugins. From the outside, the free PluginPeek scan below reads the version from the site's public files.
How do I fix a vulnerable plugin?
Make a full backup, then update it from Dashboard > Updates and check the site afterwards. If you would rather not, we can do it for a fixed $99, paid after you have checked the site.