Vulnerability · Published May 18, 2026 · Assigned by WPScan

CVE-2026-3220Multiple Plugins - Unauthenticated Stored XSS via Minify Library

High 8.8

In plain English

A high-severity cross-site scripting in Autoptimize 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 25% of all known vulnerabilities).

Severity (CVSS 3.1)8.8High

Exploit odds (30 days)0.3%top 74.9% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official description

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.

Affected products (as reported)

Vendor	Product	Versions
Unknown	Autoptimize	0 – before 3.1.15
Unknown	Clearfy Cache	0 – before 2.4.2
Unknown	Speed Optimizer	0 – before 7.7.9

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

References

https://wpscan.com/vulnerability/3ceabf11-23cd-4c38-ba14-014348b0ff2d/ exploit, vdb-entry, technical-description