CVE-2026-87760: CWE-79 Cross-Site Scripting (XSS) in Web Vitals Tracking
Description
The Web Vitals Tracking WordPress plugin through 5.4.2 does not validate or escape performance measurements submitted by unauthenticated visitors before storing them and outputting them in a script context on an administrative page, allowing unauthenticated attackers to perform Stored Cross-Site Scripting attacks against administrators.
CVSS v3.1
Score 8.8high
Affected software
Web Vitals Tracking
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-87760 is a stored Cross-Site Scripting vulnerability in the Web Vitals Tracking WordPress plugin versions up to and including 5.4.2. The flaw arises from improper validation and escaping of performance measurement inputs submitted by unauthenticated visitors. These inputs are stored and later output within a script context on an administrative page, enabling attackers to execute arbitrary scripts in administrator browsers.
Potential Impact
An unauthenticated attacker can exploit this vulnerability to execute arbitrary JavaScript in the context of an administrator's browser. This could lead to session hijacking, privilege escalation, or other malicious actions performed with administrator privileges. The vulnerability affects the confidentiality and integrity of the administrative interface.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is available, restrict access to the administrative pages and consider disabling the plugin if possible. Monitor for updates from the plugin vendor to apply patches promptly once released.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- WPScan
- Date Reserved
- 2026-09-09T07:22:39.450Z
- State
- PUBLISHED
Threat ID: 6acb2de32cdf04f656b78d0b
Added to database: 10/11/2026, 06:34:11 UTC
Last enriched: 10/11/2026, 07:03:23 UTC
Last updated: 10/11/2026, 21:33:30 UTC
Views: 18
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