GHSA-m8fw-p3cr-6jqc Cross-Site Scripting in CKEditor4 WordCount Plugin

• Packagist typo3/cms-rte-ckeditor: >= 9.5.0, < 9.5.42 → fixed in 9.5.42 • Packagist typo3/cms-rte-ckeditor: >= 10.0.0, < 10.4.39 → fixed in 10.4.39 • Packagist typo3/cms-rte-ckeditor: >= 11.0.0, < 11.5.30 → fixed in 11.5.30

> ### CVSS: `CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:L/A:N/E:F/RL:O/RC:C` (4.4) Problem The WordCount plugin (`npm:ckeditor-wordcount-plugin`) for CKEditor4 is vulnerable to cross-site scripting when switching to the source code mode. This plugin is enabled via the `Full.yaml` configuration present, but is not active in the default configuration. In default scenarios, exploiting this vulnerability requires a valid backend user account. However, if custom plugins are used on the website frontend, which accept and reflect rich-text content submitted by users, no authentication is required. Solution Update to TYPO3 versions 9.5.42 ELTS, 10.4.39 ELTS, 11.5.30 that fix the problem described above. Credits Thanks to Sybille Peters who reported this issue, and to TYPO3 core & security team member Oliver Hader who fixed the issue. References • TYPO3-CORE-SA-2023-004 • https://github.com/w8tcha/CKEditor-WordCount-Plugin/security/advisories/GHSA-q9w4-w667-qqj4