CVE-2026-3220

Multiple Plugins - Unauthenticated Stored XSS via Minify Library

High · published May 18, 2026

CVSS v3.1
8.8
EPSS
0%
Percentile
38.1
In the wild
Unconfirmed
What it is

The Autoptimize WordPress plugin before 3.1.15, Clearfy Cache WordPress plugin before 2.4.2, Speed Optimizer WordPress plugin before 7.7.9 are vulnerable to unauthenticated Stored Cross-Site Scripting (XSS) due to a predictable replacement hash used during the HTML minification process and abusing a regular expression. This allows an attacker to inject arbitrary HTML attributes in the final HTML output by anticipating the placeholder format.

The record
Technical detail
CVSS v3.1
8.8 · HIGH
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
CVSS v4.0
Not supplied
EPSS
0.00450 · 38.1th percentile
Published
2026-05-18T06:00Z
EPSS history
Timeline
  • 18 MAY 06:00Z
    Multiple Plugins - Unauthenticated Stored XSS via Minify Library
    cvelistv5