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CVE-2024-21910 — Cross-site scripting vulnerability in tinymce —...

MEDIUM

Cross-site scripting vulnerability in TinyMCE plugins

Published November 2, 2021Updated July 8, 2026Source: osv

Summary

### Impact A cross-site scripting (XSS) vulnerability was discovered in the URL processing logic of the `image` and `link` plugins. The vulnerability allowed arbitrary JavaScript execution when updating an image or link using a specially crafted URL. This issue only impacted users while editing and the dangerous URLs were stripped in any content extracted from the editor. This impacts all users who are using TinyMCE 5.9.2 or lower. ### Patches This vulnerability has been patched in TinyMCE 5.10.0 by improved sanitization logic when updating URLs in the relevant plugins. ### Workarounds To work around this vulnerability, either: - Upgrade to TinyMCE 5.10.0 or higher - Disable the `image` and `link` plugins ### Acknowledgements Tiny Technologies would like to thank Yakir6 for discovering this vulnerability. ### References https://www.tiny.cloud/docs/release-notes/release-notes510/#securityfixes ### For more information If you have any questions or comments about this advisory: * Email us at [infosec@tiny.cloud](mailto:infosec@tiny.cloud) * Open an issue in the [TinyMCE repo](https://github.com/tinymce/tinymce/issues)

Advisory Timeline

  • First published November 2, 2021 (1805 days ago).
  • Last revised July 8, 2026 — 1709 days after initial publication.

Remediation

Upgrade to the fixed version using your package manager.

npm
Update tinymce to 5.10.0 or later
npm install tinymce@5.10.0
Composer
Update tinymce/tinymce to 5.10.0 or later
composer require "tinymce/tinymce:^5.10.0"
pip
Update django-tinymce to 3.4.0 or later
pip install "django-tinymce>=3.4.0"
NuGet
Update TinyMCE to 5.10.0 or later
dotnet add package TinyMCE --version 5.10.0

After upgrading, run your dependency scanner again to confirm the vulnerability is resolved.

Affected Packages (4)

Affects 4 ecosystems: npm (1), nuget (1), packagist (1), pypi (1).

PackageEcosystemAffectedFixed In
tinymce
npm
All versions5.10.0
tinymce/tinymce
packagist
4.0.0, 4.0.1, 4.0.10, 4.0.11 (+159 more)5.10.0
django-tinymce
pypi
1.0, 1.1, 1.2, 1.3 (+40 more)3.4.0
TinyMCE
nuget
3.4.3.2, 3.4.4, 3.4.5, 3.4.7 (+168 more)5.10.0

Vulnerability Classification

Common Weakness Enumeration (CWE) identifiers for this vulnerability type.

CVSS Score Breakdown

What the CVSS (Common Vulnerability Scoring System) 6.1 score means for each attack dimension.

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Scope
Changed
Confidentiality
Low
Integrity
Low
Availability
None

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

References

Frequently Asked Questions

What is CVE-2024-21910?
Cross-site scripting vulnerability in TinyMCE plugins This vulnerability has been assigned a severity rating of MEDIUM (CVSS score: 6.1/10).
How do I check if my project is affected by CVE-2024-21910?
CVE-2024-21910 affects tinymce, tinymce/tinymce and django-tinymce (and 1 more). Use GeekWala's free vulnerability scanner to check your dependencies against CVE-2024-21910 and 200,000+ other known vulnerabilities.

Severity & Exploitability

CVSS Score
6.1

Exploitation requires specific conditions or has limited impact. Remediate within weeks.

Also Known As

GHSA-r8hm-w5f7-wj39
PYSEC-2026-632

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