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Vulnerability record · CVE-2021-24376 · published 21 June 2021

CVE-2021-24376: Autoptimize unrestricted file upload vulnerability

Autoptimize · Autoptimize

The Autoptimize WordPress plugin before 2.7.8 attempts to delete malicious files (such as .php) form the uploaded archive via the "Import Settings" feature, after its extraction. However, the extracted folders are not checked and it is possible to upload a zip which contained a directory with PHP file in it and then it is not removed from the disk. It is a bypass of CVE-2020-24948 which allows sending a PHP file via the "Import Settings" functionality to achieve Remote Code Execution.

9.8 CVSS 3.1 Critical EPSS 3.7% · top 10.6% CWE-434 · Unrestricted file upload
9.8CVSS 3.1 base score, v2 7.5
3.7%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
2References, 2 tagged exploit
17 Jun 2026Last modified by NVD

Description

The Autoptimize WordPress plugin before 2.7.8 attempts to delete malicious files (such as .php) form the uploaded archive via the "Import Settings" feature, after its extraction. However, the extracted folders are not checked and it is possible to upload a zip which contained a directory with PHP file in it and then it is not removed from the disk. It is a bypass of CVE-2020-24948 which allows sending a PHP file via the "Import Settings" functionality to achieve Remote Code Execution.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://wpscan.com/vulnerability/93edcc23-894a-46c2-84d2-407dcb64ba1e ExploitThird Party Advisory
https://wpscan.com/vulnerability/93edcc23-894a-46c2-84d2-407dcb64ba1e ExploitThird Party Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

8.1CVE-2021-24377Autoptimize race condition vulnerabilityThe Autoptimize WordPress plugin before 2.7.8 attempts to remove potential malicious files from the extracted archive uploaded via the 'Import Settin…EPSS 1.2%7.2CVE-2020-24948Autoptimize unrestricted file upload vulnerabilityThe ao_ccss_import AJAX call in Autoptimize Wordpress Plugin 2.7.6 does not ensure that the file provided is a legitimate Zip file, allowing high pri…EPSS 13%4.8CVE-2023-2113Autoptimize vulnerabilityThe Autoptimize WordPress plugin before 3.1.7 does not sanitise and escape the settings imported from a previous export, allowing high privileged use…EPSS 0.47%4.8CVE-2022-2635Autoptimize cross-site scripting vulnerabilityThe Autoptimize WordPress plugin before 3.1.1 does not sanitise and escape some of its settings, which could allow high privilege users such as admin…EPSS 0.63%4.8CVE-2021-24378Autoptimize cross-site scripting vulnerabilityThe Autoptimize WordPress plugin before 2.7.8 does not check for malicious files such as .html in the archive uploaded via the 'Import Settings' feat…EPSS 0.62%4.8CVE-2021-24332Autoptimize cross-site scripting vulnerabilityThe Autoptimize WordPress plugin before 2.8.4 was missing proper escaping and sanitisation in some of its settings, allowing high privilege users to …EPSS 0.63%10.0CVE-2026-56291Balbooa Forms Joomla extension unauthenticated arbitrary file upload RCEThe Balbooa Forms extension for Joomla before version 2.4.1 accepts file uploads without authentication and does not restrict file type, allowing exe…KEVEPSS 15%analysed10.0CVE-2026-48939iCagenda Joomla extension unrestricted file upload leads to PHP RCEThe iCagenda extension for Joomla fails to restrict file types in its file attachment feature, allowing arbitrary file uploads that result in PHP cod…KEVEPSS 20%analysed

Source: NIST National Vulnerability Database (record CVE-2021-24376), CISA KEV, FIRST EPSS (scores of 2026-09-29). This page is refreshed as NVD updates the record.