CVE-2026-19224 Hummingbird < 3.21.2 - Admin+ Network-Wide RCE via Hub Connector on Multisite
A site administrator can execute arbitrary code across the entire multisite network due to insufficient permission checks in the Hub Connector setting.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-19224?
CVE-2026-19224 is a high-severity code injection vulnerability in Unknown Hummingbird Performance, published on 4 Sep 2026. An attacker needs administrator access to exploit it, with no action from the victim.
Official description
The Hummingbird Performance WordPress plugin before 3.21.2 does not restrict a network-wide setting to network administrators, allowing an administrator of any single site on a multisite network to execute arbitrary code across the entire network.
Weakness: CWE-94
Which versions are affected by CVE-2026-19224?
How do I fix CVE-2026-19224?
No fix has been published for CVE-2026-19224 yet. Limit exposure of the affected software until one is available.
Upgrade, and never evaluate templates, expressions or code built from user input. More about Code injection.
Is CVE-2026-19224 being exploited?
There is no known exploitation of CVE-2026-19224 in the wild and no public exploit code.
Sources
Also known as GHSA-v4wx-7r7q-x8q9.