Cross-site scripting in WordPress - #VU151464
Published: September 20, 2026
Vulnerability identifier: #VU151464
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 user to execute arbitrary script code in a victim's browser.
The vulnerability exists due to improper neutralization of input during web page generation in custom-header preview handling when rendering stored custom-header information. A remote privileged user can store crafted custom-header information to execute arbitrary script code in a victim's browser.
Only themes that support custom headers and do not register an admin-preview-callback are affected.
Affected software
WordPress
Remediation
Install security update from vendor's website.
WordPress - addressed in versions 4.7.36, 4.8.31, 4.9.32, 5.0.28, 5.1.25, 5.2.27, 5.3.24, 5.4.22, 5.5.21, 5.6.20, 5.7.18, 5.8.16, 5.9.17, 6.0.15, 6.1.13, 6.2.12, 6.3.11, 6.4.11, 6.5.11, 6.6.8, 6.7.8, 6.8.9, 6.9.8, 7.0.5, 7.1.1