CVE-2026-88824
The Master Blocks WordPress plugin before 1.5.0 does not have authorisation on one of its REST routes, allowing unauthenticated users to update its settings, including a value that is output unescaped in the admin area, leading to Stored XSS that executes in the session of any administrator visiting a wp-admin page.
- Published Sep 19, 2026
- CVSS 8.8 high
- 0.5% chance of exploitation in the next 30 days (EPSS)
- A fix is available