--- title: TYPO3 10.4.3 and 9.5.18 maintenance releases published url: "https://news.typo3.com/article/typo3-1043-and-9518-maintenance-releases-published" description: The versions 10.4.3 and 9.5.18 of the TYPO3 Enterprise Content Management System have just been released. image: "https://news.typo3.com/_assets/d1e01514e4c4a5b3147940fa2ec50682/Images/og-image-news.jpg" date: 2026-06-11 modified: 2026-06-11 categories: - "Developer & Technology" --- # TYPO3 10.4.3 and 9.5.18 maintenance releases published - [Developer & Technology](https://news.typo3.com/article/category/developer-technology) TYPO3 10.4.3 and 9.5.18 maintenance releases published ====================================================== 19 May 2020 The versions 10.4.3 and 9.5.18 of the TYPO3 Enterprise Content Management System have just been released. - ![](https://news.typo3.com/typo3temp/assets/t3g/blog/gravatar/b8266fdc667b773926c59081862ab148.jpeg)[Oliver Hader](https://news.typo3.com/article/author/oliver-hader) The following TYPO3 updates have been released: - TYPO3 10.4.3 LTS - TYPO3 9.5.18 LTS Both versions are maintenance releases only. They aim to reduce and fix side-effects of recent TYPO3 v10.4.2 and v9.5.17 releases. ### Further upgrade instructions **Upgrade Wizard - Manual actions required** Sites that were upgraded from an older TYPO3 version to TYPO3 v9 LTS before version 9.5.11 (<9.5.11) most probably require the invocation of **["Update backend user configuration array"](https://docs.typo3.org/c/typo3/cms-core/master/en-us/Changelog/9.5.x/Important-89269-IntroduceUpgradeWizardForInvalidBackendUserConfiguration.html)** upgrade wizard - this can be done in the backend interface at *Admin Tools > Upgrade > Upgrade Wizard*. This wizard was introduced with TYPO3 v9.5.11, the necessity to run it was not emphasized enough back then. ### Download TYPO3 can be installed in various ways. For example the traditional way by using the source package at [get.typo3.org](https://get.typo3.org) or the modern way by setting up a project using composer, to name just two. Further details can be found in the according release notes: - - ### Details on side-effects in previous relases - change for **TYPO3-CORE-SA-2020-004** caused side-effects on extension- or user-land code interacting with caches in Extbase, showing deserialization errors for ReflectionService (see [Forge issue #91404](https://forge.typo3.org/issues/91404)) - change for **TYPO3-CORE-SA-2020-005** causes side-effects for sites that were upgraded from versions before TYPO3 v8 and were upgrade before TYPO3 v9.5.11, e.g. causing problems in the page-tree (see [Forge issue #91407](https://forge.typo3.org/issues/91407)) - *$BE\_USER->uc* probably can contain class references to stdClass which need to be converted - TYPO3 v9.5.11 add a corresponding **Update backend user configuration array** upgrade wizard - to be found at Admin Tools > Upgrade > Upgrade Wizard > Update backend user configuration array - change for **TYPO3-CORE-SA-2020-006** introduced a strict referrer check, blocking cross-site requests and thus also blocking single-sign-on (SSO) implementations (see [Forge issue #91396](https://forge.typo3.org/issues/91396)) ![](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)