CVE-2026-47760: Tinymce Cross-Site Scripting Vulnerability

Q: What is CVE-2026-47760?

CVE-2026-47760 is a security vulnerability in Tinymce involving TinyMCE Cross-Site Scripting (XSS) vulnerability using sanitization bypass through nested SVGs under CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting').

Q: Which Tinymce versions are affected?

Affected versions include releases prior to 7.1.0 across affected packages: tinymce, TinyMCE, tinymce/tinymce.

Q: What version fixes CVE-2026-47760?

Upgrading to 7.1.0 (or the latest patched release for your respective branch) resolves the vulnerability.

Q: Is tinymce affected?

Yes, tinymce is affected in releases prior to 7.1.0. Upgrade your dependency to 7.1.0 or later.

Q: Is TinyMCE affected?

Yes, TinyMCE is affected in releases prior to 7.1.0. Upgrade your dependency to 7.1.0 or later.

Q: What is the CVSS score of CVE-2026-47760?

CVE-2026-47760 has a CVSS v3.1 base score of 8.7 (HIGH) with vector string CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N.

Q: What CWE is associated with CVE-2026-47760?

CVE-2026-47760 is classified under CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') (The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.).

Q: How can I check npm dependencies for CVE-2026-47760?

Run the dependency tree command: 'npm ls tinymce'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.

HIGH

Advisory Identifier: GHSA-mh5m-5hw4-5c69

CVSS 8.7

CWE-79

Published 2026-06-05

Advisory Summary

CVE-2026-47760 is a HIGH (CVSS 8.7) cross-site scripting vulnerability (CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')) affecting Tinymce libraries in the npm ecosystem. The issue involves tinymce cross-site scripting (xss) vulnerability using sanitization bypass through nested svgs. Remediation is available by upgrading affected packages to version 7.1.0.

CVE-2026-47760 at a Glance

CVE Identifier CVE-2026-47760

GHSA Identifier GHSA-mh5m-5hw4-5c69

Severity HIGH

CVSS v3.1 Base Score 8.7

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

Affected Product Tinymce

Package Ecosystem npm

Published Date 2026-06-05

Last Updated 2026-06-05

Security Impact

CVSS: 8.7

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N).

Attack Vector Network (AV:N)

Attack Complexity Low (AC:L)

Privileges Required Low (PR:L)

User Interaction Required (UI:R)

Scope Changed (S:C)

Confidentiality High (C:H)

Integrity High (I:H)

Availability None (A:N)

How to Fix CVE-2026-47760

To remediate this vulnerability, upgrade all affected Tinymce dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

tinymce fixed: 7.1.0

npm install tinymce@7.1.0

TinyMCE fixed: 7.1.0

Upgrade TinyMCE to 7.1.0

tinymce/tinymce fixed: 7.1.0

Upgrade tinymce/tinymce to 7.1.0

Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release:

npm ls tinymce

How to Check if You Are Affected

To determine whether your Node.js application is affected by CVE-2026-47760, inspect your project dependencies using npm:

npm ls tinymce

Analyze the terminal output to locate any version of Tinymce in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 7.1.0), your application is affected.

Note: The npm ls tinymce command inspects dependencies declared in your package.json and lockfile; it does not perform automated runtime dynamic scanning.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting'), where the product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users. In Tinymce, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

### Impact TinyMCE 6.8.x contains an XSS vulnerability caused by improper SVG namespace scope handling in the sanitizer. A crafted payload using nested <svg> elements can bypass attribute sanitization and execute arbitrary JavaScript. ### Patches This issue affects TinyMCE 6.8.x-7.0.x. The vulnerability is fixed in TinyMCE 7.1.0 and later. ### Workarounds No official workaround available. ### Acknowledgements Tiny thanks [maple3142](https://github.com/maple3142) (<https://maple3142.net>) of DEVCORE for their help identifying this vulnerability. ### References Fix introduced in TinyMCE 7.1.0 though a rewrite of code causing the vulnerability.

CVE-2026-47760 Affected Tinymce Versions

3 component(s)

Fixed Versions:

7.1.0

Product / Package	Ecosystem	Affected Versions	Fixed Version
tinymce npm/tinymce	npm	≥ 6.8.0 < 7.1.0	7.1.0
TinyMCE nuget/TinyMCE	NuGet	≥ 6.8.0 < 7.1.0	7.1.0
tinymce/tinymce	Packagist	≥ 6.8.0 < 7.1.0	7.1.0

References

GitHub Advisory / Wiki ADVISORY

https://github.com/tinymce/tinymce/security/advisories/GHSA-mh5m-5hw4-5c69

NVD — CVE-2026-47760 NVD

https://nvd.nist.gov/vuln/detail/CVE-2026-47760

Tinymce Source Repository REPOSITORY

https://github.com/tinymce/tinymce

Frequently Asked Questions

What is CVE-2026-47760?

CVE-2026-47760 is a security vulnerability in Tinymce involving TinyMCE Cross-Site Scripting (XSS) vulnerability using sanitization bypass through nested SVGs under CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting').

Which Tinymce versions are affected?

Affected versions include releases prior to 7.1.0 across affected packages: tinymce, TinyMCE, tinymce/tinymce.

What version fixes CVE-2026-47760?

Upgrading to 7.1.0 (or the latest patched release for your respective branch) resolves the vulnerability.

Is tinymce affected?

Yes, tinymce is affected in releases prior to 7.1.0. Upgrade your dependency to 7.1.0 or later.

Is TinyMCE affected?

Yes, TinyMCE is affected in releases prior to 7.1.0. Upgrade your dependency to 7.1.0 or later.

What is the CVSS score of CVE-2026-47760?

CVE-2026-47760 has a CVSS v3.1 base score of 8.7 (HIGH) with vector string CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N.

What CWE is associated with CVE-2026-47760?

CVE-2026-47760 is classified under CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') (The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.).

How can I check npm dependencies for CVE-2026-47760?

Run the dependency tree command: 'npm ls tinymce'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.

Machine-readable OSV JSON OSV v1.5 Schema

Normalized schema output

View Raw JSON

{
  "schema_version" : "1.4.0",
  "id" : "GHSA-mh5m-5hw4-5c69",
  "modified" : "2026-06-05T20:09:38Z",
  "published" : "2026-06-05T20:09:38Z",
  "aliases" : [ "CVE-2026-47760" ],
  "summary" : "TinyMCE Cross-Site Scripting (XSS) vulnerability using sanitization bypass through nested SVGs",
  "details" : "### Impact\nTinyMCE 6.8.x contains an XSS vulnerability caused by improper SVG namespace scope handling in the sanitizer. A crafted payload using nested <svg> elements can bypass attribute sanitization and execute arbitrary JavaScript.\n\n### Patches\nThis issue affects TinyMCE 6.8.x-7.0.x. The vulnerability is fixed in TinyMCE 7.1.0 and later.\n\n### Workarounds\nNo official workaround available.\n\n### Acknowledgements\nTiny thanks [maple3142](https://github.com/maple3142) (<https://maple3142.net>) of DEVCORE for their help identifying this vulnerability.\n\n### References\nFix introduced in TinyMCE 7.1.0 though a rewrite of code causing the vulnerability.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "npm",
      "name" : "tinymce"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "6.8.0"
      }, {
        "fixed" : "7.1.0"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "NuGet",
      "name" : "TinyMCE"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "6.8.0"
      }, {
        "fixed" : "7.1.0"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "Packagist",
      "name" : "tinymce/tinymce"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "6.8.0"
      }, {
        "fixed" : "7.1.0"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/tinymce/tinymce/security/advisories/GHSA-mh5m-5hw4-5c69"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-47760"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/tinymce/tinymce"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-79" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-06-05T20:09:38Z",
    "nvd_published_at" : "2026-05-28T16:16:28Z"
  }
}

CVSS V3

8.7 HIGH