CVE-2020-12648 – tinymce

Package

Manager: npm
Name: tinymce
Vulnerable Version: >=0 <4.9.11 || >=5.0.0 <5.4.1

Severity

Level: Medium

CVSS v3.1: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N

EPSS: 0.00056 pctl0.17575

Details

Cross-site scripting vulnerability in TinyMCE ### Impact A cross-site scripting (XSS) vulnerability was discovered in the core parser. The vulnerability allowed arbitrary JavaScript execution when inserting a specially crafted piece of content into the editor via the clipboard or APIs. This impacts all users who are using TinyMCE 4.9.10 or lower and TinyMCE 5.4.0 or lower. ### Patches This vulnerability has been patched in TinyMCE 4.9.11 and 5.4.1 by improved HTML parsing and sanitization logic. ### Workarounds The workarounds available are: - upgrade to either TinyMCE 4.9.11 or TinyMCE 5.4.1 or - enable the media plugin, which overrides the default parsing behaviour for iframes or - add the following workaround to update the parsing schema rules for iframes: #### Example: Change the default schema for iframes ```js setup: function(editor) { editor.on('PreInit', function() { editor.schema.getSpecialElements()['iframe'] = /</iframe[^>]*>/gi; }); } ``` ### Acknowledgements Tiny Technologies would like to thank George Steketee and Chris Davis at [Bishop Fox](https://www.bishopfox.com/) for discovering this vulnerability. ### References https://www.tiny.cloud/docs/release-notes/release-notes54/#securityfixes ### For more information If you have any questions or comments about this advisory: * Open an issue in the [TinyMCE repo](https://github.com/tinymce/tinymce/issues) * Email us at [infosec@tiny.cloud](mailto:infosec@tiny.cloud)

Metadata

Created: 2020-08-11T14:55:01Z
Modified: 2023-05-22T14:51:38Z
Source: https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2020/08/GHSA-vrv8-v4w8-f95h/GHSA-vrv8-v4w8-f95h.json
CWE IDs: ["CWE-79"]
Alternative ID: GHSA-vrv8-v4w8-f95h
Finding: F008
Auto approve: 1