WordPress plugin
Hummingbird Performance – Cache & Page Speed Optimization for Core Web Vitals | Critical CSS | Minify CSS | Defer CSS Javascript | CDN security & vulnerabilities
No known unpatched vulnerabilities in the latest version
All 9 known vulnerabilities are fixed in the latest release. If you run an older version, update to null or newer.
- Critical1
- High2
- Medium6
- Low0
All Hummingbird Performance – Cache & Page Speed Optimization for Core Web Vitals | Critical CSS | Minify CSS | Defer CSS Javascript | CDN vulnerabilities
| Severity | Vulnerability | CVE | Published |
|---|---|---|---|
| Critical9.8 | Unauthenticated Remote Code Execution via Cookie Name in Page Cache Debug Log ≤3.21.0Update to 3.21.1 | CVE-2026-83627 | |
| High7.2 | Authenticated (Administrator+) Remote Code Execution <3.21.2Update to 3.21.2 | CVE-2026-19224 | |
| High7.5 | Unauthenticated Sensitive Information Exposure via Log File ≤3.18.0Update to 3.18.1 | CVE-2025-14437 |
- Critical9.8Unauthenticated Remote Code Execution via Cookie Name in Page Cache Debug Log
≤3.21.0Update to 3.21.1
- High7.2Authenticated (Administrator+) Remote Code Execution
<3.21.2Update to 3.21.2
- High7.5Unauthenticated Sensitive Information Exposure via Log File
≤3.18.0Update to 3.18.1
Hummingbird Performance – Cache & Page Speed Optimization for Core Web Vitals | Critical CSS | Minify CSS | Defer CSS Javascript | CDN: common questions
Does Hummingbird Performance – Cache & Page Speed Optimization for Core Web Vitals | Critical CSS | Minify CSS | Defer CSS Javascript | CDN have known vulnerabilities?
Yes. VulnCrest Radar lists 9 known vulnerabilities in Hummingbird Performance – Cache & Page Speed Optimization for Core Web Vitals | Critical CSS | Minify CSS | Defer CSS Javascript | CDN: 1 critical, 2 high, 6 medium. None are known to affect version null.
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 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 Hummingbird Performance – Cache & Page Speed Optimization for Core Web Vitals | Critical CSS | Minify CSS | Defer CSS Javascript | CDN vulnerability?
CVE-2026-121763, published Nov 7, 2026: Hummingbird Performance – Cache & Page Speed Optimization for Core Web Vitals | Critical CSS | Minify CSS | Defer CSS Javascript | CDN <= 3.21.2 - Authenticated (Subscriber+) Stored Cross-Site Scripting. Severity: Medium (CVSS 6.4).
Is any Hummingbird Performance – Cache & Page Speed Optimization for Core Web Vitals | Critical CSS | Minify CSS | Defer CSS Javascript | CDN vulnerability listed in CISA KEV?
No. None of the known Hummingbird Performance – Cache & Page Speed Optimization for Core Web Vitals | Critical CSS | Minify CSS | Defer CSS Javascript | CDN vulnerabilities is currently listed in the CISA KEV catalog.