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cve.new
CVE-2026-116675high8.5

TinyMCE Cross-Site Scripting (XSS) vulnerability using media plugin `data-mce-object` serialization

Check your stack

The advisory, in context

Impact

Stored XSS vulnerability in the media plugin. Attackers can inject malicious scripts via elements crafted through the data-mce-object attribute, which are created and executed before sanitization. Impacts users of TinyMCE with the media plugin enabled.

Patches

This vulnerability has been patched in TinyMCE 8.9.3 and TinyMCE 7.9.4 by ensuring that, when using the media plugin, any content created through the data-mce-object attribute is properly sanitized first.

Workarounds

No official workaround available.

Fix

To avoid this vulnerability:

Upgrade to TinyMCE 8.9.3 or higher. Upgrade to TinyMCE 7.9.4 or higher.

Acknowledgements

Tiny thanks Fariskhi Vidyan and David Vieira Kurz (HiSolutions AG) for their help identifying this vulnerability.

Affected packages

Start with the recorded fix for your release branch. Check your installed version and test compatibility before upgrading. Fixing this advisory does not rule out other vulnerabilities in the release.

Semantic versions

From 8.5.1 before 8.9.3

Fixed in 8.9.3

View affected-version evidence
{
  "ranges": [
    {
      "events": [
        {
          "introduced": "8.5.1"
        },
        {
          "fixed": "8.9.3"
        }
      ],
      "type": "SEMVER"
    }
  ],
  "versions": []
}
Ecosystem versions

From 8.5.1 before 8.9.3

Fixed in 8.9.3

9 explicitly affected versions

8.5.1, 8.6.0, 8.7.0, 8.8.0, 8.8.1, 8.8.2, 8.9.0, 8.9.1, 8.9.2

View affected-version evidence
{
  "ranges": [
    {
      "events": [
        {
          "introduced": "8.5.1"
        },
        {
          "fixed": "8.9.3"
        }
      ],
      "type": "ECOSYSTEM"
    }
  ],
  "versions": [
    "8.5.1",
    "8.6.0",
    "8.7.0",
    "8.8.0",
    "8.8.1",
    "8.8.2",
    "8.9.0",
    "8.9.1",
    "8.9.2"
  ]
}
Ecosystem versions

From 8.5.1 before 8.9.3

Fixed in 8.9.3

9 explicitly affected versions

8.5.1, 8.6.0, 8.7.0, 8.8.0, 8.8.1, 8.8.2, 8.9.0, 8.9.1, 8.9.2

View affected-version evidence
{
  "ranges": [
    {
      "events": [
        {
          "introduced": "8.5.1"
        },
        {
          "fixed": "8.9.3"
        }
      ],
      "type": "ECOSYSTEM"
    }
  ],
  "versions": [
    "8.5.1",
    "8.6.0",
    "8.7.0",
    "8.8.0",
    "8.8.1",
    "8.8.2",
    "8.9.0",
    "8.9.1",
    "8.9.2"
  ]
}
Semantic versions

From 7.9.3 before 7.9.4

Fixed in 7.9.4

1 explicitly affected versions

7.9.3

View affected-version evidence
{
  "ranges": [
    {
      "events": [
        {
          "introduced": "7.9.3"
        },
        {
          "fixed": "7.9.4"
        }
      ],
      "type": "SEMVER"
    }
  ],
  "versions": [
    "7.9.3"
  ]
}
Ecosystem versions

From 7.9.3 before 7.9.4

Fixed in 7.9.4

1 explicitly affected versions

7.9.3

View affected-version evidence
{
  "ranges": [
    {
      "events": [
        {
          "introduced": "7.9.3"
        },
        {
          "fixed": "7.9.4"
        }
      ],
      "type": "ECOSYSTEM"
    }
  ],
  "versions": [
    "7.9.3"
  ]
}
Ecosystem versions

From 7.9.3 before 7.9.4

Fixed in 7.9.4

1 explicitly affected versions

7.9.3

View affected-version evidence
{
  "ranges": [
    {
      "events": [
        {
          "introduced": "7.9.3"
        },
        {
          "fixed": "7.9.4"
        }
      ],
      "type": "ECOSYSTEM"
    }
  ],
  "versions": [
    "7.9.3"
  ]
}

References