CVE-2022-23494: Cross-site scripting vulnerability in TinyMCE alerts
First published: Thu Dec 08 2022(Updated: )
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.
Credit: security-advisories@github.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| TinyMCE | <5.10.7 | |
| TinyMCE | >=6.0.0<6.3.1 |
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Reference Links
- https://github.com/tinymce/tinymce/commit/6923d85eba6de3e08ebc9c5a387b5abdaa21150e
- https://github.com/tinymce/tinymce/commit/8bb2d2646d4e1a718fce61a775fa22e9d317b32d
- https://github.com/tinymce/tinymce/security/advisories/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
- https://www.tiny.cloud/docs/tinymce/6/file-image-upload/#images_upload_handler
Frequently Asked Questions
What is CVE-2022-23494?
CVE-2022-23494 is a cross-site scripting (XSS) vulnerability discovered in the alert and confirm dialogs of the TinyMCE rich text editor.
How does CVE-2022-23494 occur?
CVE-2022-23494 can occur when the alert or confirm dialogs in plugins, such as the image plugin, are provided with malicious HTML content.
What is the severity of CVE-2022-23494?
CVE-2022-23494 has a severity score of 6.1, which is considered medium.
Which versions of TinyMCE are affected by CVE-2022-23494?
Versions up to and exclusive of 5.10.7 and versions from 6.0.0 to 6.3.1 of TinyMCE are affected by CVE-2022-23494.
How can I fix CVE-2022-23494?
To fix CVE-2022-23494, it is recommended to update to a version of TinyMCE that is not affected by the vulnerability.
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