What is CVE-2026-88824?

CVE-2026-88824 is a high-severity vulnerability in Master Blocks, classified under Cross-site Scripting. CVSS score: 8.8/10. Published 2026-09-19.

How severe is CVE-2026-88824?

High severity. CVSS v3 base score is 8.8 out of 10.

XSS in Master Blocks

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.

Vulnerability class: XSS (Cross-Site Scripting)

CVSS v3 metric

CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.

Affected products

Unknown Master Blocks

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

contact@wpscan.com (technical-description, exploit, vdb-entry)

Frequently asked questions

What is CVE-2026-88824?: CVE-2026-88824 is a high-severity vulnerability in Master Blocks, classified under Cross-site Scripting. CVSS score: 8.8/10. Published 2026-09-19.
How severe is CVE-2026-88824?: High severity. CVSS v3 base score is 8.8 out of 10.