Vulnerability · Published Sep 19, 2026 · Assigned by WPScan
CVE-2026-88824Master Blocks 1.4.1 - 1.4.1.4 - Unauthenticated Stored XSS via White Label Settings
High 8.8
In plain English
A high-severity cross-site scripting in Master Blocks from Unknown. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 43% of all known vulnerabilities).
Severity (CVSS 3.1)8.8High
Exploit odds (30 days)0.5%top 56.7% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official description
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.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Unknown | Master Blocks | 1.4.1 – before 1.5.0 |
Weakness: CWE-79 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
References
- https://wpscan.com/vulnerability/898fda0a-4d27-4def-ae6f-35bf25a8ae8d/ exploit, vdb-entry, technical-description