CVE-2021-24640Network attack vector

Contributor-level stored XSS via unescaped minWidth attribute

Published Sep 20, 2021 · Updated Aug 3, 2024

Stored XSS in eedee Gutenslider before 5.2.0 allows remote authenticated users with contributor access to execute script in visitors' browsers. The plugin inserts the minWidth Gutenberg block attribute into rendered output without escaping it, allowing stored markup to become executable browser content. Contributor privileges are sufficient to store the payload, but exploitation requires another user to view the affected content; the resulting script runs in that viewer's browser context.

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 eedee Gutenslider before 5.2.0 allows remote authenticated users with contributor access to execute script in visitors' browsers. The plugin inserts the minWidth Gutenberg block attribute into rendered output without escaping it, allowing stored markup to become executable browser content. Contributor privileges are sufficient to store the payload, but exploitation requires another user to view the affected content; the resulting script runs in that viewer's browser context.

The record

CVE
CVE-2021-24640
Published
Sep 20, 2021
Updated
Aug 3, 2024
Vendor
eedee
Product
Gutenslider
Classifications
CWE-79, T1059.007
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 20, 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=5.2.0 <5.2.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

eedee · Gutensliderversion=5.2.0 <5.2.0

Published CVSS scores

3.5NVDAV:N/AC:M/Au:S/C:N/I:P/A:N
5.4NVDCVSS: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 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/JScript

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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