CVE-2026-15383
Received Received - Intake

Blog Floating Button WordPress Plugin Stored Cross-Site Scripting

Publication date: 2026-08-03

Last updated on: 2026-08-03

Assigner: WPScan

Description
The Blog Floating Button WordPress plugin through 1.4.20 does not sanitize or escape the visitor User-Agent header, which it stores through an unauthenticated tracking REST endpoint and later renders unescaped in an administrator report page. This allows an unauthenticated attacker to store a malicious script that executes in the session of any administrator who views the access report, leading to site takeover.

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Meta Information

Published
2026-08-03
Last Modified
2026-08-03
Generated
2026-08-03
AI Q&A
2026-08-03
EPSS Evaluated
N/A
NVD
CVE-2026-15383
EUVD
EUVD-2026-52174

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
blog_floating_button plugin 1.4.20

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-UNKNOWN

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Executive Summary

This vulnerability exists in the Blog Floating Button WordPress plugin up to version 1.4.20. It fails to sanitize or escape the visitor's User-Agent header, which is stored via an unauthenticated tracking REST endpoint. The stored data is later displayed unescaped in an administrator report page, enabling an unauthenticated attacker to inject malicious scripts that execute when an administrator views the report.

Detection Guidance

Check WordPress admin reports for unusual scripts in the access logs. Inspect the visitor User-Agent header for suspicious payloads. Review the plugin's tracking REST endpoint logs for unauthenticated requests.

Impact Analysis

An unauthenticated attacker could exploit this to take over your WordPress site. When an administrator views the access report, the injected script runs in their session, potentially allowing the attacker to gain full control of your site, modify content, or steal sensitive data.

Compliance Impact

This vulnerability could lead to a data breach, violating GDPR and HIPAA requirements for protecting user data. If exploited, it may result in unauthorized access to personal or health information, leading to legal penalties, fines, or reputational damage.

Mitigation Strategies

Update the Blog Floating Button plugin to the latest version. Disable the plugin if no update is available. Implement input sanitization for User-Agent headers. Monitor admin reports for malicious scripts.

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