--- title: "IMPORTANT-SECURITY-BULLETIN-PRE-ANNOUNCEMENT-1: Important Security-Bulletin Pre-Announcement" url: "https://news.typo3.com/security/advisory/important-security-bulletin-pre-announcement-1" description: The TYPO3 security team has identified a critical security issue in the TYPO3 core. image: "https://news.typo3.com/_assets/d1e01514e4c4a5b3147940fa2ec50682/Images/og-image-news.jpg" date: 2026-06-11 modified: 2026-06-11 categories: - "Developer & Technology" - Security --- # IMPORTANT-SECURITY-BULLETIN-PRE-ANNOUNCEMENT-1: Important Security-Bulletin Pre-Announcement - [Developer & Technology](https://news.typo3.com/article/category/developer-technology) - [Security](https://news.typo3.com/article/category/security-1) IMPORTANT-SECURITY-BULLETIN-PRE-ANNOUNCEMENT-1: Important Security-Bulletin Pre-Announcement ============================================================================================ 08 April 2010 ![A laptop screen displaying a list of security advisories](https://news.typo3.com/typo3temp/assets/_processed_/d/c/csm_security_blog_default_77f8e86036.webp) The TYPO3 security team has identified a critical security issue in the TYPO3 core. - ![](https://news.typo3.com/typo3temp/assets/t3g/blog/gravatar/bbf959d8e683550c90ae922aff9145d8.jpeg)[Marcus Krause](https://news.typo3.com/article/author/marcus-krause) Vulnerable are all versions of TYPO3 4.3.x. We will release TYPO3 4.3.3 and publish mitigation advices together with a security bulletin on [http://typo3.org](https://typo3.org/help/security-advisories) on Friday, April 9 at 11:00 am CEST (9:00 am GMT). Since this is a very important security fix, please be prepared to update your TYPO3 installations on Friday. Until the advisory is out, please understand that we cannot provide any further information. ![](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)