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

CVE-2021-24693Published · Updated

Action summary

Affected: ≤3.9.4Update to 3.9.5 or newer

All remediation steps
Watch plugin
Severity
Critical9.0
CVSS
9.0
CVSS 3.1 · CNA (Wordfence)
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H
What does this vector mean?
AV:N Attack vector
Network
AC:L Attack complexity
Low
PR:L Privileges required
Low
UI:R User interaction
Required
S:C Scope
Changed
C:H Confidentiality
High
I:H Integrity
High
A:H Availability
High
Weakness
CWE-79 Cross-Site Scripting
Required access
Unknown
Exploit prediction (EPSS)
No score
CISA KEV
Not listed
On this page8

Am I affected?

Simple Download Monitor simple-download-monitor

  1. Affected≤ 3.9.4
  2. Patched in3.9.5

Update to 3.9.5 or newer.

You are affected if you run ≤ 3.9.4. Version 3.9.5 and later are not affected by this issue.

  • Check your version: in wp-admin go to Plugins → Installed Plugins and read the version under Simple Download Monitor.
  • No admin access? Run a passive check of your site. It reads public files only.

What to do

  1. Update to version 3.9.5, or a newer patched version
  2. Rotate administrator passwords and application secrets if the site ran a vulnerable version while publicly reachable.
  3. Watch Simple Download Monitor to get an email when the next vulnerability is published.

Advisory

Source description from Wordfence Intelligence, credited to apple502j.

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

Exploits & references

Proof-of-concept & detection

No public proof-of-concept or detection template is known for this vulnerability.

Advisories & patches

More in Simple Download Monitor

All 18
More vulnerabilities in Simple Download Monitor
SeverityVulnerabilityCVEPublished
Medium4.3Missing Authorization
<4.1.3Update to 4.1.3
CVE-2026-118637
Medium6.4Authenticated (Contributor+) Stored Cross-Site Scripting via Custom Field
≤4.0.5Update to 4.0.6
CVE-2026-2383
Medium6.4Authenticated (Contributor+) Stored Cross-Site Scripting
≤3.9.34Update to 3.9.35
CVE-2025-58197
Medium6.5Simple Download Monitor <= 3.9.33 – Authenticated (Contributor+) SQL Injection via order parameter in Log Export functionality
≤3.9.33Update to 3.9.34
CVE-2025-8977
Medium4.9Authenticated (Administrator+) SQL Injection
≤3.9.25Update to 3.9.26
CVE-2025-24663

Same weakness (Cross-Site Scripting)

All Cross-Site Scripting
Other Cross-Site Scripting vulnerabilities
SeverityVulnerabilityCVEPublished
High7.2Unauthenticated Stored Cross-Site Scripting via Comment User-Agent Header
EZ SQL Reports Shortcode Widget and DB Backup≤5.25.25Update to 5.26.45
CVE-2026-120688
Critical9.8Unauthenticated Arbitrary File Upload via File Upload via Public Form Submission
Chatterbug Forms – Fast, Flexible WordPress Form Builder≤1.0.2Update to 1.1
CVE-2026-125055
Critical9.8Unauthenticated PHP Object Injection to Remote Code Execution via 'form' Parameter
ELEX WordPress HelpDesk & Customer Ticketing System≤3.3.9Update to 3.4.0
CVE-2026-119077
Medium5.3Unauthenticated Sensitive Information Exposure in 'search' Parameter
Customer Reviews for WooCommerce≤5.127.0Update to 5.128.0
CVE-2026-121518

Timeline

  1. CVE published

    Severity critical, CVSS 9.0

  2. Record last updated

Sources & licenses

Wordfence record
Vulnerability data
Wordfence Intelligence. Copyright 2012-2026 Defiant Inc. Licensed under the CC BY-SA 4.0.
CVE® identifiers
Copyright 1999-2026 The MITRE Corporation. Used under the CVE Program. CVE® is a registered trademark of The MITRE Corporation.
CVSS / CWE
National Vulnerability Database (NVD), shown unmodified. This product uses the NVD API but is not endorsed or certified by the NVD.
VulnCrest content
Summary, remediation guidance and page layout © VulnCrest. Not sourced from NVD.

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