CVE-2026-88824CWE-79cross-site-scripting

CVE-2026-88824

High · published September 19, 2026

CVSS v3.1
8.8
EPSS
1%
Percentile
42.2
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
8.8 · HIGH
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
CVSS v4.0
Not supplied
EPSS
0.00505 · 42.2th percentile
Weakness
CWE-79 · Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Published
2026-09-19T11:16Z
References (1)
https://wpscan.com/vulnerability/898fda0a-4d27-4def-ae6f-35bf25a8ae8d/ · [email protected]
EPSS history
Timeline
  • 20 SEP 03:24Z
    EPSS moved — → 0%
    epss
  • 19 SEP 06:00Z
    Master Blocks 1.4.1 - 1.4.1.4 - Unauthenticated Stored XSS via White Label Settings
    cvelistv5