Headline
GHSA-gg8r-xjwq-4w92: Cross-site scripting vulnerability in TinyMCE alerts
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_handlerreturns a valid value as per the images_upload_handler documentation.
References
- https://www.tiny.cloud/docs/release-notes/release-notes5107/#securityfixes
- https://www.tiny.cloud/docs/tinymce/6/6.3-release-notes/#security-fixes
For more information
If you have any questions or comments about this advisory:
- Email us at [email protected]
- Open an issue in the TinyMCE repo
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
- https://www.tiny.cloud/docs/release-notes/release-notes5107/#securityfixes
- https://www.tiny.cloud/docs/tinymce/6/6.3-release-notes/#security-fixes
For more information
If you have any questions or comments about this advisory:
- Email us at [email protected]
- Open an issue in the TinyMCE repo
References
- GHSA-gg8r-xjwq-4w92
- https://www.tiny.cloud/docs/release-notes/release-notes5107/#securityfixes
- https://www.tiny.cloud/docs/tinymce/6/6.3-release-notes/#security-fixes
lnewson published the maintainer security advisory
Dec 8, 2022
Severity
Moderate
5.4
/ 10
CVSS base metrics
Attack vector
Network
Attack complexity
Low
Privileges required
Low
User interaction
Required
Scope
Changed
Confidentiality
Low
Integrity
Low
Availability
None
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
Weaknesses
No CWEs
CVE ID
CVE-2022-23494
GHSA ID
GHSA-gg8r-xjwq-4w92
Source code
tinymce/tinymce
Checking history
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Related news
tinymce is an open source rich text editor. 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. 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. Users are advised to upgrade to either 5.10.7 or 6.3.1. Users unable to upgrade may ensure the the `images_upload_handler` returns a valid value as per the images_upload_handler documentation.