Hummingbird Performance – Cache & Page Speed Optimization for Core Web Vitals | Critical CSS | Minify CSS | Defer CSS Javascript | CDN vulnerabilities

Product

Hummingbird Performance – Cache & Page Speed Optimization for Core Web Vitals | Critical CSS | Minify CSS | Defer CSS Javascript | CDN

by wpmudev · last CVE Sep 5, 2026

CVEs

On KEV

9.8

Max CVSS

New 30D

Vulnerabilities1 In the news0 Timeline

Severity mix

Critical 1High 0Medium 0Low 0

Severity

All severities1 Critical1 High0 Medium0 Low0

Exploitation

On CISA KEV0 Exploited in the wild0

Watch

Add Hummingbird Performance – Cache & Page Speed Optimization for Core Web Vitals | Critical CSS | Minify CSS | Defer CSS Javascript | CDN to your stack to get only the CVEs that touch what you run.

CVE	CVSS	EPSS	Published	Summary · affected versions
CVE-2026-83627	9.8	1%	Sep 5	Hummingbird – Speed Optimization, Caching, Minify, Compress & CDN <= 3.21.0 - Unauthenticated Remote Code Execution via Cookie Name in Page Cache Debug Log Affected: through 3.21.0