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WS-2021-0025

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Date: February 19, 2021

A cross-site scripting (XSS) vulnerability was discovered in the URL sanitization logic of the core parser of TinyMCE. The vulnerability allowed arbitrary JavaScript execution when inserting a specially crafted piece of content into the editor using the clipboard or APIs. This impacts all users who are using TinyMCE 5.5.1 or lower. The issue has been fixed in TinyMCE 5.6.0.

Language: TYPE_SCRIPT

Severity Score

Severity Score

Weakness Type (CWE)

Cross-Site Scripting (XSS)

CWE-79

Top Fix

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Upgrade Version

Upgrade to version tinymce - 5.6.0

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CVSS v3.1

Base Score:
Attack Vector (AV): NETWORK
Attack Complexity (AC): LOW
Privileges Required (PR): NONE
User Interaction (UI): REQUIRED
Scope (S): CHANGED
Confidentiality (C): LOW
Integrity (I): LOW
Availability (A): NONE

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