--- title: "TYPO3-CORE-SA-2020-012: XML External Entity in Dashboard Widget" url: "https://news.typo3.com/security/advisory/typo3-core-sa-2020-012" description: It has been discovered that TYPO3 CMS 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: - "Developer & Technology" - "Product Updates & Roadmap" - TYPO3 CMS --- # TYPO3-CORE-SA-2020-012: XML External Entity in Dashboard Widget - [Developer & Technology](https://news.typo3.com/article/category/developer-technology) - [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-2020-012: XML External Entity in Dashboard Widget =============================================================== 17 November 2020 ![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 CMS is susceptible to XML external entity processing. - ![](https://news.typo3.com/typo3temp/assets/t3g/blog/gravatar/b8266fdc667b773926c59081862ab148.jpeg)[Oliver Hader](https://news.typo3.com/article/author/oliver-hader) - **Component Type:** TYPO3 CMS - **Subcomponent:** Dashboard (ext:dashboard) - **Release Date:** November 17, 2020 - **Vulnerability Type:** XML External Entity - **Affected Versions:** 10.4.0-10.4.9 - **Severity:** Low - **Suggested CVSS:** [CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:L/I:N/A:L/E:U/RL:O/RC:R](https://nvd.nist.gov/vuln-metrics/cvss/v3-calculator?vector=AV:N/AC:H/PR:L/UI:R/S:U/C:L/I:N/A:L/E:U/RL:O/RC:R&version=3.1) - **References:** [CVE-2020-26229](https://nvd.nist.gov/vuln/detail/CVE-2020-26229), [CWE-611](https://cwe.mitre.org/data/definitions/611.html) ### Problem Description It has been discovered that RSS widgets are susceptible to XML external entity processing. This vulnerability is reasonable, but is theoretical - it was not possible to actually reproduce the vulnerability with current PHP versions of supported and maintained system distributions. At least with *libxml2* version 2.9, the processing of XML external entities is disabled per default - and cannot be exploited. Besides that, a valid backend user account is needed. ### Solution Update to TYPO3 version 10.4.10 that fixes the problem described. ### Credits Thanks to Victoria Lee who reported this issue and to TYPO3 security team member Oliver Hader who fixed the issue. ### General Advice Follow the recommendations that are given in the [TYPO3 Security Guide](https://docs.typo3.org/typo3cms/CoreApiReference/Security/Index.html#security). 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 in 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/cc7cba9757f98fbe05023a139119df74.jpeg) About the Author [Oliver Hader](https://news.typo3.com/article/author/oliver-hader) Core Developer at TYPO3 GmbH,Hof, Germany [Website](https://typo3.com)[Twitter](https://twitter.com/ohader)[LinkedIn](https://www.linkedin.com/in/oliverhader/)[Xing](https://www.xing.com/profile/Oliver_Hader) Oliver started to work with TYPO3 in 2005 and was fascinated by the product and its universe. Since 2007 he is member of the TYPO3 Core Team. After going back to university in 2014 for achieving a postgraduate master degree in internet web science, he is now researching on advanced web technology topics in general and for TYPO3 in particular. In his spare time, Oliver loves to go cycling cross-country in the uplands around Hof (Germany) in northern Bavaria - at the region where he's living as well. [More posts by this author](https://news.typo3.com/article/author/oliver-hader)