CVE-2024-21910Network attack vector

Cross-site scripting via unsanitized plugin URLs

Published Jan 3, 2024 · Updated Jul 14, 2026

Cross-site scripting in TinyMCE before 5.10.0 allows remote attackers to execute JavaScript through crafted image or link URLs. The image and link plugins' URL-processing logic fails to sanitize a crafted URL when an editor updates the corresponding element. Execution occurs only in an editing user's browser, and the dangerous URL is removed from content extracted from the editor.

CVSS severity6.1
Medium
EPSS probability0.96%
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 TinyMCE before 5.10.0 allows remote attackers to execute JavaScript through crafted image or link URLs. The image and link plugins' URL-processing logic fails to sanitize a crafted URL when an editor updates the corresponding element. Execution occurs only in an editing user's browser, and the dangerous URL is removed from content extracted from the editor.

The record

CVE
CVE-2024-21910
Published
Jan 3, 2024
Updated
Jul 14, 2026
Vendor
Tiny Technologies
Product
TinyMCE
Classifications
CWE-79, T1059.007
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 3, 2024CVE publishedPublication date reported by the CVE source.
  2. Jul 14, 2026Record 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=0 <5.10.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Tiny Technologies · TinyMCEversion=0 <5.10.0

Published CVSS scores

6.1TinyMCECVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
6.1CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
6.1NVDCVSS: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')
T1059.007Command and Scripting Interpreter: JavaScript

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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