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PatchSiren cyber security CVE debrief

CVE-2026-47760 tinymce CVE debrief

TinyMCE versions 6.8.0 through 7.0.x contain a high-severity cross-site scripting (XSS) vulnerability in the editor's sanitizer component. The flaw stems from improper handling of SVG namespace scope, allowing crafted payloads with nested elements to bypass attribute sanitization and execute arbitrary JavaScript. This vulnerability was disclosed and fixed in version 7.1.0. The CVSS 3.1 score of 8.7 reflects network attack vector, low attack complexity, required privileges, user interaction, and changed scope with high impact to confidentiality and integrity. No known exploitation in ransomware campaigns has been reported. Organizations using affected versions should prioritize upgrading to 7.1.0 or later.

Vendor
tinymce
Product
Unknown
CVSS
HIGH 8.7
CISA KEV
Not listed in stored evidence
Original CVE published
2026-05-28
Original CVE updated
2026-05-28
Advisory published
2026-05-28
Advisory updated
2026-05-28

Who should care

Organizations using TinyMCE versions 6.8.0 through 7.0.x in web applications, particularly those accepting user-generated rich text content. Development teams maintaining content management systems, forums, email clients, or any application embedding TinyMCE for HTML editing. Security teams responsible for XSS prevention in web application portfolios.

Technical summary

The vulnerability exists in TinyMCE's HTML sanitizer when processing SVG elements. The sanitizer fails to properly account for namespace scope boundaries when handling nested elements, allowing malicious attributes to persist through sanitization. An attacker can craft a payload using nested SVG elements that bypasses the attribute filtering logic, resulting in arbitrary JavaScript execution when the sanitized content is rendered in a victim's browser. The attack requires user interaction (e.g., viewing crafted content) and some level of privileges to submit content through the editor, but the changed scope (S:C) indicates impact beyond the vulnerable component's security context.

Defensive priority

high

Recommended defensive actions

  • Upgrade TinyMCE to version 7.1.0 or later
  • Review and audit any stored rich text content that may have been processed by affected TinyMCE versions
  • Implement Content Security Policy (CSP) headers as defense-in-depth for XSS mitigation
  • Validate that third-party integrations or plugins using TinyMCE are updated to patched versions
  • Monitor application logs for suspicious SVG or nested element patterns in user-submitted content

Evidence notes

Vulnerability confirmed through vendor security advisory and NVD analysis. Affected versions explicitly defined as 6.8.0 through versions before 7.1.0. Fix version 7.1.0 confirmed. CWE-79 (Improper Neutralization of Input During Web Page Generation) classified as primary weakness.

Official resources

2026-05-28