--- title: "TYPO3-CORE-SA-2016-020: Cross-Site Scripting in third party library mso/idna-convert" url: "https://news.typo3.com/security/advisory/typo3-core-sa-2016-020" description: It has been discovered, that TYPO3 ships example code of mso/idna-convert library that is vulnerable to Cross-Site Scripting image: "https://news.typo3.com/_assets/d1e01514e4c4a5b3147940fa2ec50682/Images/og-image-news.jpg" date: 2026-06-11 modified: 2026-06-11 categories: - "Product Updates & Roadmap" - TYPO3 CMS --- # TYPO3-CORE-SA-2016-020: Cross-Site Scripting in third party library mso/idna-convert - [Product Updates & Roadmap](https://news.typo3.com/article/category/product-updates-roadmap) - Security / [TYPO3 CMS](https://news.typo3.com/article/category/security/typo3-cms) TYPO3-CORE-SA-2016-020: Cross-Site Scripting in third party library mso/idna-convert ==================================================================================== 19 July 2016 ![A laptop screen displaying a list of security advisories](https://news.typo3.com/typo3temp/assets/_processed_/d/c/csm_security_blog_default_77f8e86036.webp) It has been discovered, that TYPO3 ships example code of mso/idna-convert library that is vulnerable to Cross-Site Scripting - ![](https://news.typo3.com/typo3temp/assets/t3g/blog/gravatar/7569d41262328e5ed8d27b53e03970ec.png)[Helmut Hummel](https://news.typo3.com/article/author/helmut-hummel) **Component Type:** TYPO3 CMS **Release Date:** July 19, 2016 **Vulnerability Type:** Cross-Site Scripting **Affected Versions:** 7.6.0 to 7.6.9 and 8.0.0 to 8.2.0 **Severity:** Low **Suggested CVSS v2.0:** [AV:N/AC:L/Au:S/C:N/I:P/A:N/E:F/RL:O/RC:C](http://jvnrss.ise.chuo-u.ac.jp/jtg/cvss/cvss2.cgi?vector=%28AV:N/AC:L/Au:S/C:N/I:P/A:N/E:F/RL:O/RC:C%29&g=2&lang=en) **CVE:** not assigned yet **Problem Description:** TYPO3 ships example code from mso/idna-convert library in the vendor folder, which is vulnerable to Cross-Site Scripting. **Solution:** Update to TYPO3 versions 7.6.10 or 8.2.1 that fix the problem described. **Alternative Solution:** Make sure to not expose the vendor directory to the publicly accessible document root. In composer managed installation, make sure to configure a dedicated web folder. In general it is recommended to not expose the complete typo3\_src sources folder in the document root. **Credits:** Thanks to Frank Huber who discovered and reported the issue. **General Advice:** Follow the recommendations that are given in the [TYPO3 Security Guide](http://docs.typo3.org/typo3cms/SecurityGuide/ "Opens external link in new window"). Please subscribe to the [typo3-announce](http://lists.typo3.org/cgi-bin/mailman/listinfo/typo3-announce) mailing list. **General Note:** All security related code changes are tagged so that you can easily look them up on our [review system](https://review.typo3.org/#/q/status:merged+project:Packages/TYPO3.CMS+topic:security,n,z). ![](https://news.typo3.com/typo3temp/assets/t3g/blog/gravatar/bb9efc51bced8582e7b8c235f4b5f2b5.png) About the Author [Helmut Hummel](https://news.typo3.com/article/author/helmut-hummel) [More posts by this author](https://news.typo3.com/article/author/helmut-hummel)