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    CVE-2026-3220

    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.

    Published:May 18, 2026
    Last Modified:May 18, 2026
    EPS:May 18, 2026
    EPSS Score:0.00029
    CVSS Score:8.8

    Affected Products

    Vendor
    Autoptimize
    Product
    Autoptimize
    Vendor
    Clearfy Cache
    Product
    Clearfy Cache
    Vendor
    Speed Optimizer
    Product
    Speed Optimizer
    Vendor
    Wordpress
    Product
    Wordpress

    Exploits

    No exploit reference

    Related CVEs

    CVE-2023-2113 (CVSS 4.8) — The Autoptimize WordPress plugin before 3.1.7 does not sanitise and escape the settings imported from a previo…
    CVE-2022-2635 (CVSS 4.8) — The Autoptimize WordPress plugin before 3.1.1 does not sanitise and escape some of its settings, which could a…
    CVE-2021-24378 (CVSS 4.8) — The Autoptimize WordPress plugin before 2.7.8 does not check for malicious files such as .html in the archive …
    CVE-2021-24377 (CVSS 8.1) — The Autoptimize WordPress plugin before 2.7.8 attempts to remove potential malicious files from the extracted …
    CVE-2021-24376 (CVSS 9.8) — The Autoptimize WordPress plugin before 2.7.8 attempts to delete malicious files (such as .php) form the uploa…
    CVE-2021-24332 (CVSS 4.8) — The Autoptimize WordPress plugin before 2.8.4 was missing proper escaping and sanitisation in some of its sett…
    CVE-2020-24948 (CVSS 7.2) — The ao_ccss_import AJAX call in Autoptimize Wordpress Plugin 2.7.6 does not ensure that the file provided is a…

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High
    CVE-2026-3220 — Autoptimize, Clearfy_Cache + (High 8.8) | CVE-DB