CVE-2024-24815Network attack vector

JavaScript execution via faulty CDATA boundary detection

Published Feb 7, 2024 · Updated Feb 13, 2025

Cross-site scripting in CKSource CKEditor 4 before 4.24.0-lts allows remote attackers to execute JavaScript through malformed HTML. The core HTML parser previously tokenized content while tracking CDATA state, allowing malformed closing markup to escape Advanced Content Filtering. Exploitation requires user interaction and either full-page editing or a filter configuration that enables CDATA elements, including script or style.

CVSS severity6.1
Medium
EPSS probability0.71%
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 CKSource CKEditor 4 before 4.24.0-lts allows remote attackers to execute JavaScript through malformed HTML. The core HTML parser previously tokenized content while tracking CDATA state, allowing malformed closing markup to escape Advanced Content Filtering. Exploitation requires user interaction and either full-page editing or a filter configuration that enables CDATA elements, including script or style.

The record

CVE
CVE-2024-24815
Published
Feb 7, 2024
Updated
Feb 13, 2025
Vendor
CKSource
Product
CKEditor 4
Classifications
CWE-79, T1203
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 7, 2024CVE publishedPublication date reported by the CVE source.
  2. Feb 13, 2025Record 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=< 4.24.0-lts

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

CKSource · CKEditor 4version=< 4.24.0-lts

Published CVSS scores

6.1GitHub Advisory DatabaseCVSS:3.1/AV:N/AC:L/PR:N/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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

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

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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