CVE-2020-17480 – tinymce

Package

Manager: npm
Name: tinymce
Vulnerable Version: >=0 <4.9.7 || >=5.0.0 <5.1.4

Severity

Level: High

CVSS v3.1: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:N/I:L/A:N/E:U/RL:O/RC:C

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

EPSS: 0.00881 pctl0.74511

Details

Cross-site scripting vulnerability in TinyMCE ### Impact A cross-site scripting (XSS) vulnerability was discovered in: the core parser, `paste` and `visualchars` plugins. 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 4.9.6 or lower and TinyMCE 5.1.3 or lower. ### Patches This vulnerability has been patched in TinyMCE 4.9.7 and 5.1.4 by improved parser logic and HTML sanitization. ### Workarounds The workarounds available are: - disable the impacted plugins - manually sanitize the content using the `BeforeSetContent` event (see below) - upgrade to either TinyMCE 4.9.7 or TinyMCE 5.1.4 #### Example: Manually sanitize content ```js editor.on('BeforeSetContent', function(e) { var sanitizedContent = ...; // Manually sanitize content here e.content = sanitizedContent; }); ``` ### Acknowledgements Tiny Technologies would like to thank Michał Bentkowski for discovering this vulnerability. ### References https://www.tiny.cloud/docs/release-notes/release-notes514/#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: 2020-01-30T21:22:15Z
Modified: 2023-06-27T16:50:58Z
Source: https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2020/01/GHSA-27gm-ghr9-4v95/GHSA-27gm-ghr9-4v95.json
CWE IDs: ["CWE-79"]
Alternative ID: GHSA-27gm-ghr9-4v95
Finding: F008
Auto approve: 1