--- title: "SECURITY-ISSUE-IN-THIRD-PARTY-TYPO3-EXTENSION-CALENDAR-BASE-CAL: Security issue in third party TYPO3 extension \"Calendar Base\" (cal)" url: "https://news.typo3.com/security/advisory/security-issue-in-third-party-typo3-extension-calendar-base-cal" description: "A security vulnerabilitiy has been discovered in the third party TYPO3 extension \"Calendar Base\"." image: "https://news.typo3.com/_assets/d1e01514e4c4a5b3147940fa2ec50682/Images/og-image-news.jpg" date: 2026-06-11 modified: 2026-06-11 categories: - "Developer & Technology" - Security --- # SECURITY-ISSUE-IN-THIRD-PARTY-TYPO3-EXTENSION-CALENDAR-BASE-CAL: Security issue in third party TYPO3 extension "Calendar Base" (cal) - [Developer & Technology](https://news.typo3.com/article/category/developer-technology) - [Security](https://news.typo3.com/article/category/security-1) SECURITY-ISSUE-IN-THIRD-PARTY-TYPO3-EXTENSION-CALENDAR-BASE-CAL: Security issue in third party TYPO3 extension "Calendar Base" (cal) ==================================================================================================================================== 02 March 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) A security vulnerabilitiy has been discovered in the third party TYPO3 extension "Calendar Base". - ![](https://news.typo3.com/typo3temp/assets/t3g/blog/gravatar/7569d41262328e5ed8d27b53e03970ec.png)[Helmut Hummel](https://news.typo3.com/article/author/helmut-hummel) For further information on the issue in the extension "Calendar Base" (cal), please read the related advisory TYPO3-SA-2010-005 that was published today: In general the TYPO3 Security Team recommends to read the following pages: The TYPO3 Security Cookbook: http://typo3.org/fileadmin/security-team/typo3\_security\_cookbook\_v-0.5.pdf See all TYPO3 security advisories: http://typo3.org/teams/security/security-bulletins/ ![](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)