Cross-site scripting in WordPress - #VU158640
Published: November 2, 2026
Vulnerability identifier: #VU158640
CSH Severity: Low
CVSS v4: 4.8 [CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N]
CVE-ID: N/A
CWE-ID: CWE-79
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote privileged user to potentially execute arbitrary script in a viewer's browser through an unsafe username stored using direct database access.
The vulnerability exists due to improper output escaping in the WordPress multisite Network Users screens when rendering usernames. A remote privileged user can use direct database access to store a specially crafted username that may execute script when a viewer opens an affected screen.
Affected software
WordPress
Remediation
Install security update from vendor's website.
WordPress - addressed in versions 4.7.39, 4.8.34, 4.9.35, 5.0.31, 5.1.28, 5.2.30, 5.3.27, 5.4.25, 5.5.24, 5.6.23, 5.7.21, 5.8.19, 5.9.20, 6.0.18, 6.1.16, 6.2.15, 6.3.14, 6.4.14, 6.5.14, 6.6.11, 6.7.11, 6.8.12, 6.9.11, 7.0.8, 7.1.4