CVE-2023-45818: XSS
First published: Thu Oct 19 2023(Updated: )
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.
Credit: security-advisories@github.com security-advisories@github.com security-advisories@github.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Tiny Tinymce | <5.10.8 | |
| Tiny Tinymce | >=6.0.0<6.7.1 |
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Reference Links
- https://github.com/tinymce/tinymce/security/advisories/GHSA-v65r-p3vv-jjfv
- https://tiny.cloud/docs/release-notes/release-notes5108/#securityfixes
- https://tiny.cloud/docs/tinymce/6/6.7.1-release-notes/#security-fixes
- https://nvd.nist.gov/vuln/detail/CVE-2023-45818
- https://researchgate.net/publication/266654651_mXSS_attacks_Attacking_well-secured_web-applications_by_using_innerHTML_mutations
- https://www.tiny.cloud/docs/api/tinymce.html/tinymce.html.saxparser/
- https://github.com/advisories/GHSA-v65r-p3vv-jjfv (Advisory)
Frequently Asked Questions
What is the impact of CVE-2023-45818?
CVE-2023-45818 is a mutation cross-site scripting (mXSS) vulnerability in TinyMCE's core undo and redo functionality.
How can an attacker exploit CVE-2023-45818?
An attacker can exploit CVE-2023-45818 by crafting a malicious HTML snippet that can execute unauthorized scripts in the user's browser.
What is the severity rating of CVE-2023-45818?
CVE-2023-45818 has a severity rating of 6.1 (medium).
What software versions are affected by CVE-2023-45818?
Versions up to 5.10.8 of tinymce/tinymce, TinyMCE, and tinymce npm package, as well as versions between 6.0.0 and 6.7.1 of tinymce/tinymce, TinyMCE, and tinymce npm package are affected by CVE-2023-45818.
How can I fix CVE-2023-45818?
To fix CVE-2023-45818, update to version 5.10.8 of tinymce/tinymce, TinyMCE, and tinymce npm package, or update to a version between 6.0.0 and 6.7.1 of tinymce/tinymce, TinyMCE, and tinymce npm package.
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