GHSA-MH5M-5HW4-5C69

Vulnerability from github – Published: 2026-06-05 20:09 – Updated: 2026-06-05 20:09
VLAI
Summary
TinyMCE Cross-Site Scripting (XSS) vulnerability using sanitization bypass through nested SVGs
Details

Impact

TinyMCE 6.8.x contains an XSS vulnerability caused by improper SVG namespace scope handling in the sanitizer. A crafted payload using nested 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://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.

Severity
8.7 (High)
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N
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{
  "affected": [
    {
      "package": {
        "ecosystem": "npm",
        "name": "tinymce"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "6.8.0"
            },
            {
              "fixed": "7.1.0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "NuGet",
        "name": "TinyMCE"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "6.8.0"
            },
            {
              "fixed": "7.1.0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Packagist",
        "name": "tinymce/tinymce"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "6.8.0"
            },
            {
              "fixed": "7.1.0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-47760"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-79"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-06-05T20:09:38Z",
    "nvd_published_at": "2026-05-28T16:16:28Z",
    "severity": "HIGH"
  },
  "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 \u003csvg\u003e 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) (\u003chttps://maple3142.net\u003e) 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.",
  "id": "GHSA-mh5m-5hw4-5c69",
  "modified": "2026-06-05T20:09:38Z",
  "published": "2026-06-05T20:09:38Z",
  "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"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "TinyMCE Cross-Site Scripting (XSS) vulnerability using sanitization bypass through nested SVGs"
}



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