CVE-2023-45818
October 19, 2023
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
tinymce (CDN_JS):
Affected version(s) >=6.0.0 <6.7.1Fix Suggestion:
Update to version 6.7.1tinymce (CDN_JS):
Affected version(s) >=3.5.8 <5.10.8Fix Suggestion:
Update to version 5.10.8tinymce (NPM):
Affected version(s) >=6.0.0 <6.7.1Fix Suggestion:
Update to version 6.7.1tinymce (NPM):
Affected version(s) >=4.0.25 <5.10.8Fix Suggestion:
Update to version 5.10.8tinymce (NUGET):
Affected version(s) >=3.4.3.2 <5.10.8Fix Suggestion:
Update to version 5.10.8tinymce (NUGET):
Affected version(s) >=6.0.0 <6.7.1Fix Suggestion:
Update to version 6.7.1Additional Notes
The description of this vulnerability differs from MITRE.
Related Resources (8)
Do you need more information?
Contact UsCVSS v4
Base Score:
5.3
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
NONE
User Interaction
PASSIVE
Vulnerable System Confidentiality
LOW
Vulnerable System Integrity
LOW
Vulnerable System Availability
NONE
Subsequent System Confidentiality
LOW
Subsequent System Integrity
LOW
Subsequent System Availability
NONE
CVSS v3
Base Score:
6.1
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
CHANGED
Confidentiality
LOW
Integrity
LOW
Availability
NONE
Weakness Type (CWE)
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
EPSS
Base Score:
1.28
