ghsa-5h9g-x5rv-25wg
Vulnerability from github
Impact
A cross-site scripting (XSS) vulnerability was discovered in the schema validation logic of the core parser. The vulnerability allowed arbitrary JavaScript execution when inserting a specially crafted piece of content into the editor using the clipboard or editor APIs. This malicious content could then end up in content published outside the editor, if no server-side sanitization was performed. This impacts all users who are using TinyMCE 5.8.2 or lower.
Patches
This vulnerability has been patched in TinyMCE 5.9.0 by ensuring schema validation was still performed after unwrapping invalid elements.
Workarounds
To work around this vulnerability, either:
- Upgrade to TinyMCE 5.9.0 or higher
- Manually sanitize the content using the BeforeSetContent event (see below)
Example: Manually sanitize content
js
editor.on('BeforeSetContent', function(e) {
var sanitizedContent = ...; // Manually sanitize content here
e.content = sanitizedContent;
});
Acknowledgements
Tiny Technologies would like to thank William Bowling for discovering this vulnerability.
References
https://www.tiny.cloud/docs/release-notes/release-notes59/#securityfixes
For more information
If you have any questions or comments about this advisory: * Email us at infosec@tiny.cloud * Open an issue in the TinyMCE repo
{
"affected": [
{
"package": {
"ecosystem": "npm",
"name": "tinymce"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "5.9.0"
}
],
"type": "ECOSYSTEM"
}
]
},
{
"package": {
"ecosystem": "NuGet",
"name": "TinyMCE"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "5.9.0"
}
],
"type": "ECOSYSTEM"
}
]
},
{
"package": {
"ecosystem": "Packagist",
"name": "tinymce/tinymce"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "5.9.0"
}
],
"type": "ECOSYSTEM"
}
]
}
],
"aliases": [
"CVE-2024-21908"
],
"database_specific": {
"cwe_ids": [
"CWE-79"
],
"github_reviewed": true,
"github_reviewed_at": "2021-10-22T13:49:23Z",
"nvd_published_at": null,
"severity": "MODERATE"
},
"details": "### Impact\nA cross-site scripting (XSS) vulnerability was discovered in the schema validation logic of the core parser. The vulnerability allowed arbitrary JavaScript execution when inserting a specially crafted piece of content into the editor using the clipboard or editor APIs. This malicious content could then end up in content published outside the editor, if no server-side sanitization was performed. This impacts all users who are using TinyMCE 5.8.2 or lower.\n\n### Patches\nThis vulnerability has been patched in TinyMCE 5.9.0 by ensuring schema validation was still performed after unwrapping invalid elements.\n\n### Workarounds\nTo work around this vulnerability, either:\n- Upgrade to TinyMCE 5.9.0 or higher\n- Manually sanitize the content using the `BeforeSetContent` event (see below)\n\n#### Example: Manually sanitize content\n```js\neditor.on(\u0027BeforeSetContent\u0027, function(e) {\n var sanitizedContent = ...; // Manually sanitize content here\n e.content = sanitizedContent;\n});\n```\n\n### Acknowledgements\nTiny Technologies would like to thank William Bowling for discovering this vulnerability.\n\n### References\nhttps://www.tiny.cloud/docs/release-notes/release-notes59/#securityfixes\n\n### For more information\nIf you have any questions or comments about this advisory:\n* Email us at [infosec@tiny.cloud](mailto:infosec@tiny.cloud)\n* Open an issue in the [TinyMCE repo](https://github.com/tinymce/tinymce/issues)",
"id": "GHSA-5h9g-x5rv-25wg",
"modified": "2024-01-03T22:34:18Z",
"published": "2021-10-22T16:24:02Z",
"references": [
{
"type": "WEB",
"url": "https://github.com/tinymce/tinymce/security/advisories/GHSA-5h9g-x5rv-25wg"
},
{
"type": "PACKAGE",
"url": "https://github.com/tinymce/tinymce"
},
{
"type": "WEB",
"url": "https://www.tiny.cloud/docs/release-notes/release-notes59/#securityfixes"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N",
"type": "CVSS_V3"
}
],
"summary": "Cross-site scripting vulnerability in TinyMCE"
}
Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.