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Cross-site scripting vulnerability in TinyMCE alerts

Moderate severity GitHub Reviewed Published Dec 8, 2022 in tinymce/tinymce • Updated Jan 28, 2023

Package

nuget TinyMCE (NuGet)

Affected versions

>= 6.0.0, < 6.3.1
< 5.10.7

Patched versions

6.3.1
5.10.7
npm tinymce (npm)
>= 6.0.0, < 6.3.1
< 5.10.7
6.3.1
5.10.7
composer tinymce/tinymce (Composer)
>= 6.0.0, < 6.3.1
< 5.10.7
6.3.1
5.10.7

Description

Impact

A cross-site scripting (XSS) vulnerability was discovered in the alert and confirm dialogs when these dialogs were provided with malicious HTML content. This can occur in plugins that use the alert or confirm dialogs, such as in the image plugin, which presents these dialogs when certain errors occur. The vulnerability allowed arbitrary JavaScript execution when an alert presented in the TinyMCE UI for the current user.

Patches

This vulnerability has been patched in TinyMCE 5.10.7 and TinyMCE 6.3.1 by ensuring HTML sanitization was still performed after unwrapping invalid elements.

Fix

To avoid this vulnerability:

  • Upgrade to TinyMCE 5.10.7 or higher for TinyMCE 5.x.
  • Upgrade to TinyMCE 6.3.1 or higher for TinyMCE 6.x.

Workaround

To reduce the impact of this vulnerability:

  • Ensure the the images_upload_handler returns a valid value as per the images_upload_handler documentation.

References

For more information

If you have any questions or comments about this advisory:

References

@lnewson lnewson published to tinymce/tinymce Dec 8, 2022
Published by the National Vulnerability Database Dec 8, 2022
Published to the GitHub Advisory Database Dec 8, 2022
Reviewed Dec 8, 2022
Last updated Jan 28, 2023

Severity

Moderate

CVSS overall score

This score calculates overall vulnerability severity from 0 to 10 and is based on the Common Vulnerability Scoring System (CVSS).
/ 10

CVSS v3 base metrics

Attack vector
Network
Attack complexity
Low
Privileges required
Low
User interaction
Required
Scope
Changed
Confidentiality
Low
Integrity
Low
Availability
None

CVSS v3 base metrics

Attack vector: More severe the more the remote (logically and physically) an attacker can be in order to exploit the vulnerability.
Attack complexity: More severe for the least complex attacks.
Privileges required: More severe if no privileges are required.
User interaction: More severe when no user interaction is required.
Scope: More severe when a scope change occurs, e.g. one vulnerable component impacts resources in components beyond its security scope.
Confidentiality: More severe when loss of data confidentiality is highest, measuring the level of data access available to an unauthorized user.
Integrity: More severe when loss of data integrity is the highest, measuring the consequence of data modification possible by an unauthorized user.
Availability: More severe when the loss of impacted component availability is highest.
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N

EPSS score

0.319%
(70th percentile)

Weaknesses

CVE ID

CVE-2022-23494

GHSA ID

GHSA-gg8r-xjwq-4w92

Source code

Credits

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