CVE-2021-24621Public exploitNetwork attack vector

Authenticated stored XSS via unsanitized video embed code

Published Sep 13, 2021 · Updated Aug 3, 2024

Stored XSS in WP Courses LMS before 2.0.44 allows remote authenticated users to execute scripts through a crafted Video Embed Code. The plugin stores that field without sanitizing embedded iframe content, so attacker-controlled JavaScript is later rendered on the course page. High-privilege access is required to save the payload, and script execution occurs when a user opens the affected course.

CVSS severity4.8
Medium
EPSS probability0.62%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stored XSS in WP Courses LMS before 2.0.44 allows remote authenticated users to execute scripts through a crafted Video Embed Code. The plugin stores that field without sanitizing embedded iframe content, so attacker-controlled JavaScript is later rendered on the course page. High-privilege access is required to save the payload, and script execution occurs when a user opens the affected course.

The record

CVE
CVE-2021-24621
Published
Sep 13, 2021
Updated
Aug 3, 2024
Vendor
HookAndHook
Product
WP Courses LMS
Classifications
CWE-79, T1059.007
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. Sep 13, 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

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=2.0.44 <2.0.44

What conditions does exploitation require?

Attack vectornetwork
Required privilegesadmin

What is affected?

HookAndHook · WP Courses LMSversion=2.0.44 <2.0.44

Published CVSS scores

4.8WordfenceCVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N

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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesadmin
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1059.007Command and Scripting Interpreter: JavaScript/JScript

Public exploit references

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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