Cross-site scripting in TinyMCE - CVE-2024-29203

Vulnerability details

The disclosed vulnerability allows a remote attacker to perform cross-site scripting (XSS) attacks.

The vulnerability exists due to insufficient sanitization of user-supplied data in handling iframes. A remote attacker can trick the victim to follow a specially crafted link and execute arbitrary HTML and script code in user's browser in context of vulnerable website.

Successful exploitation of this vulnerability may allow a remote attacker to steal potentially sensitive information, change appearance of the web page, perform phishing and drive-by-download attacks.

Affected software

How to mitigate CVE-2024-29203

External References

• https://github.com/tinymce/tinymce/security/advisories/GHSA-438c-3975-5x3f
• https://github.com/tinymce/tinymce/commit/bcdea2ad14e3c2cea40743fb48c63bba067ae6d1
• https://www.tiny.cloud/docs/tinymce/6/6.8.1-release-notes/#new-convert_unsafe_embeds-option-that-controls-whether-object-and-embed-elements-will-be-converted-to-more-restrictive-alternatives-namely-img-for-image-mime-types-video-for-video-mime-types-audio-audio-mime-types-or-iframe-for-other-or-unspecified-mime-types
• https://www.tiny.cloud/docs/tinymce/7/7.0-release-notes/#sandbox_iframes-editor-option-is-now-defaulted-to-true

Related Security Bulletins

• Multiple vulnerabilities in TinyMCE
• Multiple vulnerabilities in Pimcore
• Cross-site scripting in IBM Maximo Asset Management
• Cross-site scripting in Oracle Application Express
• Multiple vulnerabilities in IBM Maximo Application Suite