Description
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.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| tinymce | tinymce | < 5.10.7, >= 6.0.0, < 6.3.1 | — |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 20.04 LTS | tinymce | No fix yet | — |
| Ubuntu 18.04 LTS | tinymce | No fix yet | — |
| Ubuntu 16.04 LTS | tinymce | No fix yet | — |
Affected packages
| Ecosystem | Package | Affected | Fixed | Record |
|---|---|---|---|---|
| npm | tinymce | >= 6.0.0, < 6.3.1 | 6.3.1 | GHSA-gg8r-xjwq-4w92 |
| npm | tinymce | < 5.10.7 | 5.10.7 | GHSA-gg8r-xjwq-4w92 |
| NuGet | TinyMCE | >= 6.0.0, < 6.3.1 | 6.3.1 | GHSA-gg8r-xjwq-4w92 |
| NuGet | TinyMCE | < 5.10.7 | 5.10.7 | GHSA-gg8r-xjwq-4w92 |
| Packagist | tinymce/tinymce | >= 6.0.0, < 6.3.1 | 6.3.1 | GHSA-gg8r-xjwq-4w92 |
| Packagist | tinymce/tinymce | < 5.10.7 | 5.10.7 | GHSA-gg8r-xjwq-4w92 |
Advisories 2
- WID-SEC-2023-0790 IBM Maximo Asset Management: Mehrere Schwachstellen BSI CERT-Bund (WID) · Mar 28, 2023
- WID-SEC-2023-0696 Moodle: Mehrere Schwachstellen BSI CERT-Bund (WID) · Mar 21, 2023
References
- https://github.com/tinymce/tinymce/security/advisories/GHSA-gg8r-xjwq-4w92
- https://github.com/tinymce/tinymce/commit/6923d85eba6de3e08ebc9c5a387b5abdaa21150e
- https://github.com/tinymce/tinymce/commit/8bb2d2646d4e1a718fce61a775fa22e9d317b32d
- 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