CVE-2023-48219 Special characters in unescaped text nodes can trigger mXSS in TinyMCE

2023-11-1518:59:03

CWE-79

GitHub_M

github.com

cve-2023-48219

tinymce

mutation cross-site scripting

html standard

serialization

rich text editor

api

plugins

sanitisation

patch

upgrade

vulnerability

CVSS3

6.1

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

REQUIRED

Scope

CHANGED

Confidentiality Impact

LOW

Integrity Impact

LOW

Availability Impact

NONE

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

AI Score

5.3

Confidence

High

SSVC

Exploitation

none

Automatable

Technical Impact

partial

JSON

TinyMCE is an open source rich text editor. A mutation cross-site scripting (mXSS) vulnerability was discovered in TinyMCE’s core undo/redo functionality and other APIs and plugins. Text nodes within specific parents are not escaped upon serialization according to the HTML standard. If such text nodes contain a special character reserved as an internal marker, they can be combined with other HTML patterns to form malicious snippets. These snippets pass the initial sanitisation layer when the content is parsed into the editor body, but can trigger XSS when the special internal marker is removed from the content and re-parsed. his vulnerability has been patched in TinyMCE versions 6.7.3 and 5.10.9. Users are advised to upgrade. There are no known workarounds for this vulnerability.