Cross-site scripting in WordPress - #VU158599
Published: November 2, 2026
Vulnerability identifier: #VU158599
CSH Severity: Low
CVSS v4: 5.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/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 potentially execute arbitrary script in the context of the affected website or cause a denial of service.
The vulnerability exists due to unsafe handling of __proto__ as a directive name in WordPress Interactivity API bindings when processing post content. A remote user can store crafted content containing a __proto__ directive as a Contributor or higher to interfere with binding processing, potentially resulting in stored cross-site scripting or a denial of service.
Affected software
WordPress
Remediation
Install security update from vendor's website.
WordPress - addressed in versions 6.4.14, 6.5.14, 6.6.11, 6.7.11, 6.8.12, 6.9.11, 7.0.8, 7.1.4