Vulnerability · Published Oct 19, 2023 · Assigned by GitHub_M
CVE-2023-45818Cross-site Scripting vulnerability in TinyMCE undo/redo, getContent API, resetContent API, and Autosave plugin
Medium 6.1
In plain English
A medium-severity cross-site scripting in tinymce from tinymce. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.8% (higher than 55% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official description
TinyMCE is an open source rich text editor. A mutation cross-site scripting (mXSS) vulnerability was discovered in TinyMCE’s core undo and redo functionality. When a carefully-crafted HTML snippet passes the XSS sanitisation layer, it is manipulated as a string by internal trimming functions before being stored in the undo stack. If the HTML snippet is restored from the undo stack, the combination of the string manipulation and reparative parsing by either the browser's native [DOMParser API](https://developer.mozilla.org/en-US/docs/Web/API/DOMParser) (TinyMCE 6) or the SaxParser API (TinyMCE 5) mutates the HTML maliciously, allowing an XSS payload to be executed. This vulnerability has been patched in TinyMCE 5.10.8 and TinyMCE 6.7.1 by ensuring HTML is trimmed using node-level manipulation instead of string manipulation. Users are advised to upgrade. There are no known workarounds for this vulnerability.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| NuGet | tinymce | 6.7.1 | GHSA-v65r-p3vv-jjfv |
| NuGet | tinymce | 5.10.8 | GHSA-v65r-p3vv-jjfv |
| Packagist | tinymce/tinymce | 6.7.1 | GHSA-v65r-p3vv-jjfv |
| Packagist | tinymce/tinymce | 5.10.8 | GHSA-v65r-p3vv-jjfv |
| npm | tinymce | 6.7.1 | GHSA-v65r-p3vv-jjfv |
| npm | tinymce | 5.10.8 | GHSA-v65r-p3vv-jjfv |
Affected products (as reported)
Weakness: CWE-79 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
References
- https://github.com/tinymce/tinymce/security/advisories/GHSA-v65r-p3vv-jjfv x_refsource_CONFIRM
- https://researchgate.net/publication/266654651_mXSS_attacks_Attacking_well-secured_web-applications_by_using_innerHTML_mutations x_refsource_MISC
- https://tiny.cloud/docs/release-notes/release-notes5108/#securityfixes x_refsource_MISC
- https://tiny.cloud/docs/tinymce/6/6.7.1-release-notes/#security-fixes x_refsource_MISC
- https://www.tiny.cloud/docs/api/tinymce.html/tinymce.html.saxparser/ x_refsource_MISC