CVE-2026-15383: Unknown Blog Floating Button

Medium severity, CVSS 6.1. EPSS: 0.3% chance of exploitation in the next 30 days.

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.

Affected products

• Unknown Blog Floating Button: up to and including 1.4.20

Published 2026-08-03. Last modified 2026-08-26.