Simple Download Monitor <= 3.9.4 - Contributor+ Stored Cross-Site Scripting via File Thumbnail

9.0
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CVE CVE-2021-24693
CVSS 9.0 (Critical)
Publicly Published October 5, 2021
Last Updated January 22, 2024
Researcher apple502j

Description

The Simple Download Monitor WordPress plugin before 3.9.5 does not escape the "File Thumbnail" post meta before outputting it in some pages, which could allow users with a role as low as Contributor to perform Stored Cross-Site Scripting attacks. Given the that XSS is triggered even when the Download is in a review state, contributor could make JavaScript code execute in a context of a reviewer such as admin and make them create a rogue admin account, or install a malicious plugin

Learn more about Cross-Site Scripting vulnerabilities and how to prevent them.

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Vulnerability Details for Simple Download Monitor

Software Type Plugin
Software Slug simple-download-monitor (view on wordpress.org)
Patched? Yes
Remediation Update to version 3.9.5, or a newer patched version
Affected Version
  • <= 3.9.4
Patched Version
  • 3.9.5

Recent vulnerabilities in Simple Download Monitor

# Title CVE ID CVSS Researchers Date
1 Simple Download Monitor <= 4.0.5 - Authenticated (Contributor+) Stored Cross-Site Scripting via Custom Field CVE-2026-2383 6.4 Muhammad Yudha - DJ February 26, 2026
2 Simple Download Monitor <= 3.9.33 - Simple Download Monitor <= 3.9.33 – Authenticated (Contributor+) SQL Injection via order parameter in Log Export functionality CVE-2025-8977 6.5 dutafi August 27, 2025
3 Simple Download Monitor <= 3.9.34 - Authenticated (Contributor+) Stored Cross-Site Scripting CVE-2025-58197 6.4 zaim August 27, 2025
4 Simple Download Monitor <= 3.9.25 - Authenticated (Administrator+) SQL Injection CVE-2025-24663 4.9 shinobu January 24, 2025
5 Simple Download Monitor <= 3.9.8 - Multiple Cross-Site Request Forgery vulnerabilities CVE-2021-24696 8.8 apple502j December 21, 2021
6 Simple Download Monitor <= 3.9.10 - Contributor+ Stored Cross-Site Scripting via Shortcodes CVE-2021-24694 5.4 apple502j December 21, 2021
7 Simple Download Monitor <= 3.9.5 - Contributor+ Arbitrary Thumbnail Removal CVE-2021-24698 4.3 apple502j October 5, 2021
8 Simple Download Monitor <= 3.9.5 - Sensitive Data Exposure CVE-2021-24695 5.3 apple502j October 5, 2021
9 Simple Download Monitor <= 3.9.5 - Log Reset 4.3 WPScanTeam October 5, 2021
10 Simple Download Monitor <= 3.9.4 - Reflected Cross-Site Scripting CVE-2021-24697 6.1 apple502j October 5, 2021

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