Vulnerability · Published Aug 3, 2026 · Assigned by WPScan

CVE-2026-15383Blog Floating Button <= 1.4.20 - Unauthenticated Stored XSS via User-Agent Header

Medium 6.1

In plain English

A medium-severity cross-site scripting in Blog Floating Button from Unknown. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 20% of all known vulnerabilities).

Severity (CVSS 3.1)6.1Medium

Exploit odds (30 days)0.3%top 80.0% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official 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.

Affected products (as reported)

Vendor	Product	Versions
Unknown	Blog Floating Button	0 – through 1.4.20

Weakness: CWE-79 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

References

https://wpscan.com/vulnerability/45e5d74e-6f7b-499b-ae25-74fe1bc8d18d/ exploit, vdb-entry, technical-description