CVE-2021-24464Public exploitNetwork attack vector

Stored XSS via unescaped shortcode attributes

Published Aug 2, 2021 · Updated Aug 3, 2024

Stored XSS in WpDevArt YouTube Embed, Playlist and Popup before 2.3.9 allows remote authenticated users to execute script in visitors' browsers. The wpdevart_youtube shortcode places its align, width, and height attributes into rendered output without validation, sanitization, or contextual escaping. Contributor access is sufficient to store a payload, and execution requires another user to view the content; impact is limited to actions and data available to that browser session.

CVSS severity5.4
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 WpDevArt YouTube Embed, Playlist and Popup before 2.3.9 allows remote authenticated users to execute script in visitors' browsers. The wpdevart_youtube shortcode places its align, width, and height attributes into rendered output without validation, sanitization, or contextual escaping. Contributor access is sufficient to store a payload, and execution requires another user to view the content; impact is limited to actions and data available to that browser session.

The record

CVE
CVE-2021-24464
Published
Aug 2, 2021
Updated
Aug 3, 2024
Vendor
WpDevArt
Product
YouTube Embed, Playlist and Popup
Classifications
CWE-79, T1203
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 2, 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=2.3.9 <2.3.9

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

WpDevArt · YouTube Embed, Playlist and Popupversion=2.3.9 <2.3.9

Published CVSS scores

5.4NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1203Exploitation for Client Execution

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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