Quick answers
- Is CVE-2026-19224 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-19224 being exploited in the wild.
- How severe is CVE-2026-19224?
- High severity, with a CVSS score of 7.2, published 4 September 2026.
- Which products and versions are affected?
- WPMU DEV Hummingbird Performance before 3.21.2.
- Is there a fix for CVE-2026-19224?
- A patch was published on 2026-09-04: Fixed in version 3.21.2 Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
- How is CVE-2026-19224 attacked?
- It is attacked over the network, in a software library.
- Am I affected by CVE-2026-19224?
- Check whether you run WPMU DEV Hummingbird Performance at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.
Technical details
The plugin fails to properly restrict access to network-wide settings to network administrators only, allowing a regular site administrator to modify these settings. The vulnerability is rooted in inadequate authorization checks on the Hub Connector functionality. An authenticated site administrator on a multisite WordPress network can leverage this to inject and execute arbitrary code across all sites on the network. This is a privilege escalation attack that requires administrative access to at least one site in the multisite network. The fix is available in version 3.21.2 and later.
Affected products
- WPMU DEV Hummingbird Performance before 3.21.2
Timeline
- 2026-09-02: disclosed
- 2026-09-04: patched: Fixed in version 3.21.2