CVE-2021-24693Network attack vector

Contributor stored XSS via unescaped thumbnail

Published Nov 8, 2021 · Updated Aug 3, 2024

Cross-site scripting in Tips and Tricks HQ Simple Download Monitor before 3.9.5 allows remote authenticated users to execute script via File Thumbnail. The plugin outputs the File Thumbnail post meta without escaping on affected pages, allowing a Contributor to store JavaScript that runs when a reviewer views a download, including downloads in review. Reviewer interaction is required, and the script can act with that user's privileges to create an administrator account or install a plugin.

CVSS severity9.0
Critical
EPSS probability1.28%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Cross-site scripting in Tips and Tricks HQ Simple Download Monitor before 3.9.5 allows remote authenticated users to execute script via File Thumbnail. The plugin outputs the File Thumbnail post meta without escaping on affected pages, allowing a Contributor to store JavaScript that runs when a reviewer views a download, including downloads in review. Reviewer interaction is required, and the script can act with that user's privileges to create an administrator account or install a plugin.

The record

CVE
CVE-2021-24693
Published
Nov 8, 2021
Updated
Aug 3, 2024
Vendor
Tips and Tricks HQ
Product
Simple Download Monitor
Classifications
CWE-79, T1059.007
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Nov 8, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=3.9.5 <3.9.5

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Tips and Tricks HQ · Simple Download Monitorversion=3.9.5 <3.9.5

Published CVSS scores

9.0NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H
6.0NVDAV:N/AC:M/Au:S/C:P/I:P/A:P

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1059.007JavaScript

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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