--- title: "TYPO3-CORE-SA-2016-005: XML External Entity (XXE) Processing in TYPO3 Core" url: "https://news.typo3.com/security/advisory/typo3-core-sa-2016-005" description: It has been discovered, that TYPO3 is susceptible to XML External Entity Processing 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-2016-005: XML External Entity (XXE) Processing in TYPO3 Core - [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-2016-005: XML External Entity (XXE) Processing in TYPO3 Core ========================================================================== 23 February 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 is susceptible to XML External Entity Processing - ![](https://news.typo3.com/typo3temp/assets/t3g/blog/gravatar/bbf959d8e683550c90ae922aff9145d8.jpeg)[Marcus Krause](https://news.typo3.com/article/author/marcus-krause) **Component Type:** TYPO3 CMS **Release Date:** February 23, 2016 Vulnerable subcomponent: TYPO3 CMS ---------------------------------- **Vulnerability Type:** XML External Entity Processing **Affected Versions:** Versions 6.2.0 to 6.2.18 and 7.6.0 to 7.6.3 **Severity:** Low **Suggested CVSS v2.0:** [AV:N/AC:M/Au:N/C:P/I:P/A:P/E:P/RL:O/RC:C](http://jvnrss.ise.chuo-u.ac.jp/jtg/cvss/cvss2.cgi?vector=%28AV:N/AC:M/Au:N/C:P/I:P/A:P/E:P/RL:O/RC:C%29&g=2&lang=en) **CVE:** not assigned yet **Problem Description:** All XML processing within the TYPO3 CMS are vulnerable to XEE processing. This can lead to load internal and/or external (file) content within an XML structure. Furthermore it is possible to inject arbitrary files for an XML Denial of Service attack. For more information on that topic see . **Solution:** Update to TYPO3 versions 6.2.19 or 7.6.4 that fix the problem described. **Important Note:** Systems using a PHP version with libxml2 >= 2.9 should be protected by default. Since version 2.9 the library changed its behavior to disallow external entity processing by default. **Credits:** Thanks to security team member Marcus Krause 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/b5c88386e5b1d8fca79d0652427922d2.jpeg) About the Author [Marcus Krause](https://news.typo3.com/article/author/marcus-krause) [More posts by this author](https://news.typo3.com/article/author/marcus-krause)