CVE-2021-39202CWE-79

WordPress 5.8 beta: Stored Cross-Site Scripting (XSS) vulnerability in widget

High · published September 9, 2021

CVSS v3.1
7.6
EPSS
1%
Percentile
56.8
In the wild
Unconfirmed
What it is

WordPress is a free and open-source content management system written in PHP and paired with a MySQL or MariaDB database. In affected versions the widgets editor introduced in WordPress 5.8 beta 1 has improper handling of HTML input in the Custom HTML feature. This leads to stored XSS in the custom HTML widget. This has been patched in WordPress 5.8. It was only present during the testing/beta phase of WordPress 5.8.

The record
Technical detail
CVSS v3.1
7.6 · HIGH
Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:L/A:N
CVSS v4.0
Not supplied
EPSS
0.00820 · 56.8th percentile
Weakness
CWE-79 · Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Published
2021-09-09T21:55Z
EPSS history
Timeline
  • 09 SEP 21:55Z
    WordPress 5.8 beta: Stored Cross-Site Scripting (XSS) vulnerability in widget
    cvelistv5