6.1

CVSS Score

3.1

-

CVSS Score

Basic Information

CVE ID

CVE-2024-38357

GHSA ID

GHSA-w9jx-4g6g-rp7x

EPSS Score

0.42609%

CWE

CWE-79

Published

6/19/2024

Updated

8/4/2024

KEV Status

Technology

JavaScript

Basic Information

CVE ID

GHSA ID

EPSS Score

CWE

Published

Updated

KEV Status

Technology

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CVE-2024-38357

CVE-2024-38357: TinyMCE Cross-Site Scripting (XSS) vulnerability using noscript elements

Impact

A cross-site scripting (XSS) vulnerability was discovered in TinyMCE’s content parsing code. This allowed specially crafted noscript elements containing malicious code to be executed when that content was loaded into the editor.

Patches

This vulnerability has been patched in TinyMCE 7.2.0, TinyMCE 6.8.4 and TinyMCE 5.11.0 LTS by ensuring that content within noscript elements are properly parsed.

Fix

To avoid this vulnerability:

Upgrade to TinyMCE 7.2.0 or higher.
Upgrade to TinyMCE 6.8.4 or higher for TinyMCE 6.x.
Upgrade to TinyMCE 5.11.0 LTS or higher for TinyMCE 5.x (only available as part of commercial long-term support contract).

Acknowledgements

Tiny thanks Malav Khatri and another reporter for their help identifying this vulnerability.

References

For more information

If you have any questions or comments about this advisory:

Email us at infosec@tiny.cloud
Open an issue in the TinyMCE repo

(GitHub Advisory)

Miggo Vulnerability Database

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CVE-2024-38357

CVE-2024-38357:

6.1

CVSS Score

3.1

-

CVSS Score

Basic Information

CVE ID

CVE-2024-38357

GHSA ID

GHSA-w9jx-4g6g-rp7x

EPSS Score

0.42609%

CWE

CWE-79

Published

6/19/2024

Updated

8/4/2024

KEV Status

Technology

JavaScript

Basic Information

CVE ID

GHSA ID

EPSS Score

CWE

Published

Updated

KEV Status

Technology

Technical Details

CVSS Vector

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

Package Name	Ecosystem	Vulnerable Versions	First Patched Version
tinymce	npm	< 5.11.0	5.11.0
TinyMCE	nuget	< 5.11.0	5.11.0
tinymce/tinymce	composer	< 5.11.0	5.11.0
tinymce	npm	>= 6.0.0, < 6.8.4	6.8.4
tinymce	npm	>= 7.0.0, < 7.2.0	7.2.0
TinyMCE	nuget	>= 6.0.0, < 6.8.4	6.8.4
TinyMCE	nuget	>= 7.0.0, < 7.2.0	7.2.0
tinymce/tinymce	composer	>= 6.0.0, < 6.8.4	6.8.4
tinymce/tinymce	composer	>= 7.0.0, < 7.2.0	7.2.0
django-tinymce	pip	<= 4.0.0	4.1.0

Technical Details

Vulnerability Intelligence
Miggo AI

Root Cause Analysis

The vulnerability stems from three key flaws:

In DomParser.ts, 'noscript' was incorrectly classified as a special element, bypassing proper HTML entity parsing.
In DomSerializerFilters.ts, an explicit decoding step for noscript content caused double-decoding of entities.
In NonEditableFilter.ts, missing regexp validation allowed arbitrary content injection. The commit diff shows these functions were modified to add 'noscript' exclusion, remove entity decoding, and add regex validation - directly addressing the XSS vectors described in the advisory.

Vulnerable functions

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WAF Protection Rules

WAF Rule

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Reasoning

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6.1

-

Basic Information

Basic Information

Concerned about an active attack path?

CVE-2024-38357: TinyMCE Cross-Site Scripting (XSS) vulnerability using noscript elements

Impact

Patches

Fix

Acknowledgements

References

For more information

CVE-2024-38357:

6.1

-

Basic Information

Basic Information

Technical Details

Technical Details

Vulnerability IntelligenceMiggo AI

Root Cause Analysis

Vulnerable functions

WAF Protection Rules

WAF Rule

Reasoning

Vulnerability IntelligenceMiggo AI

CVE-2024-38357: TinyMCE Cross-Site Scripting (XSS) vulnerability using noscript elements

Impact

Patches

Fix

Acknowledgements

References

For more information

6.1

6.1

Technical Details

Basic Information

Basic Information

Vulnerability IntelligenceMiggo AI

Root Cause Analysis

Vulnerable functions

WAF Protection Rules

WAF Rule

Reasoning

Vulnerability Intelligence
Miggo AI

Vulnerability Intelligence
Miggo AI

Vulnerability Intelligence
Miggo AI