CVE-2026-47759 is a high-severity cross-site scripting (XSS) vulnerability in tinymce (npm), affecting versions < 5.11.1. It is fixed in 7.9.3, 8.5.1, 5.11.1.
Impact Stored XSS vulnerability via unsanitized data-mce- attributes (data-mce-href, data-mce-src, data-mce-style). Allows attackers to inject malicious values that override safe attributes during serialization, bypassing validation. Patches Patched by stripping unsafe data-mce- attributes during parsing. Users should upgrade to the latest patched versions (5 LTS, 7.x, 8.x). Workarounds No official workaround available. Fix To avoid this vulnerability: Upgrade to TinyMCE 8.5.1 or higher. Upgrade to TinyMCE 7.9.3 or higher. Upgrade to TinyMCE 5.11.1 LTS or higher for TinyMCE 5.x (only available as part of commercial long-term support contract). Acknowledgements Tiny thanks Tadi Kadango (website) and Ivan Babenko for their help identifying this vulnerability.
Untrusted input is rendered as active markup in a victim's browser, which can run script in their session. Typical impact: session or credential theft, and actions taken as the user.
CVE-2026-47759 has a CVSS score of 8.7 (High). The vector is network-reachable, low privileges required, and user interaction required. A CVSS score reflects the worst-case severity of the vulnerability, not your specific exposure. Whether this affects your application depends on whether the vulnerable code is present and reachable in your environment.
A fixed version is available (7.9.3, 8.5.1, 5.11.1). Upgrading removes the vulnerable code path.
npm
tinymce (< 5.11.1)tinymce (>= 6.0.0, < 7.9.3)tinymce (>= 8.0.0, < 8.5.1)nuget
TinyMCE (< 5.11.1)TinyMCE (>= 6.0.0, < 7.9.3)TinyMCE (>= 8.0.0, < 8.5.1)composer
tinymce/tinymce (< 5.11.1)tinymce/tinymce (>= 6.0.0, < 7.9.3)tinymce/tinymce (>= 8.0.0, < 8.5.1)tinymce → 7.9.3 (npm)tinymce → 8.5.1 (npm)TinyMCE → 5.11.1 (nuget)TinyMCE → 7.9.3 (nuget)TinyMCE → 8.5.1 (nuget)tinymce/tinymce → 7.9.3 (composer)tinymce/tinymce → 8.5.1 (composer)Severity tells you how bad this could be in the worst case. It does not tell you whether you are exposed. Exploitability and impact are functions of runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A vulnerable package can sit in your dependency tree and never run.
Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter instead of chasing every advisory.
Kodem's runtime-powered SCA identifies whether CVE-2026-47759 is reachable in your applications. Explore open-source security for your team.
See if CVE-2026-47759 is reachable in your applications. Get a demo
Upgrade the following packages to resolve this vulnerability:
tinymce to 7.9.3 or latertinymce to 8.5.1 or laterTinyMCE to 5.11.1 or laterTinyMCE to 7.9.3 or laterTinyMCE to 8.5.1 or latertinymce/tinymce to 7.9.3 or latertinymce/tinymce to 8.5.1 or laterKodem Kai can prioritize this vulnerability in your dependency tree and generate a fix recommendation.
CVE-2026-47759 is a high-severity cross-site scripting (XSS) vulnerability in tinymce (npm), affecting versions < 5.11.1. It is fixed in 7.9.3, 8.5.1, 5.11.1. Untrusted input is rendered as active markup in a victim's browser, which can run script in their session.
CVE-2026-47759 has a CVSS score of 8.7 (High). This score reflects the worst-case severity of the vulnerability, not your specific exposure. Whether it represents real risk in your environment depends on whether the vulnerable code is present and reachable.
tinymce (npm) (versions < 5.11.1)TinyMCE (nuget) (versions < 5.11.1)tinymce/tinymce (composer) (versions < 5.11.1)Yes. CVE-2026-47759 is fixed in 7.9.3, 8.5.1, 5.11.1. Upgrade to this version or later.
Whether CVE-2026-47759 is exploitable in your environment depends on whether the vulnerable code is present and reachable. A CVSS score is a worst-case rating; it does not account for your specific deployment, configuration, or usage patterns. Kodem, an Intelligent Application Security platform, uses runtime intelligence to show which vulnerabilities actually execute in production, so you can focus on the ones that represent real risk. Get a demo
Exploitability and impact are not fixed properties of a CVE. They depend on runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A high CVSS score on a dependency that never runs is not the same as real risk. Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter.
tinymce to 7.9.3 or latertinymce to 8.5.1 or laterTinyMCE to 5.11.1 or laterTinyMCE to 7.9.3 or laterTinyMCE to 8.5.1 or latertinymce/tinymce to 7.9.3 or latertinymce/tinymce to 8.5.1 or later