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CVE-2024-29203: TinyMCE Cross-Site Scripting (XSS) vulnerability in handling iframes

March 26, 2024

A cross-site scripting (XSS) vulnerability was discovered in TinyMCE’s content insertion code. This allowed iframe elements containing malicious code to execute when inserted into the editor. These iframe elements are restricted in their permissions by same-origin browser protections, but could still trigger operations such as downloading of malicious assets.

References

  • github.com/advisories/GHSA-438c-3975-5x3f
  • github.com/tinymce/tinymce
  • github.com/tinymce/tinymce/commit/bcdea2ad14e3c2cea40743fb48c63bba067ae6d1
  • github.com/tinymce/tinymce/security/advisories/GHSA-438c-3975-5x3f
  • nvd.nist.gov/vuln/detail/CVE-2024-29203
  • www.tiny.cloud/docs/tinymce/6/6.8.1-release-notes/
  • www.tiny.cloud/docs/tinymce/7/7.0-release-notes/

Code Behaviors & Features

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Affected versions

All versions before 6.8.1

Fixed versions

  • 6.8.1

Solution

Upgrade to version 6.8.1 or above.

Impact 4.3 MEDIUM

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

Learn more about CVSS

Weakness

  • CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Source file

npm/tinymce/CVE-2024-29203.yml

Spotted a mistake? Edit the file on GitLab.

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