--- title: "TYPO3-SA-2009-019: Blind SQL Injection vulnerability in extension Calendar Base (cal)" url: "https://news.typo3.com/security/advisory/typo3-sa-2009-019" description: It has been discovered that the extension Calendar Base (cal) is vulnerable to Blind SQL Injection. image: "https://news.typo3.com/_assets/d1e01514e4c4a5b3147940fa2ec50682/Images/og-image-news.jpg" date: 2026-06-11 modified: 2026-06-11 categories: - Security --- # TYPO3-SA-2009-019: Blind SQL Injection vulnerability in extension Calendar Base (cal) - [Security](https://news.typo3.com/article/category/security-1) TYPO3-SA-2009-019: Blind SQL Injection vulnerability in extension Calendar Base (cal) ===================================================================================== 01 December 2009 ![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 the extension Calendar Base (cal) is vulnerable to Blind SQL Injection. - ![](https://news.typo3.com/typo3temp/assets/t3g/blog/gravatar/bbf959d8e683550c90ae922aff9145d8.jpeg)[Marcus Krause](https://news.typo3.com/article/author/marcus-krause) **Release Date:** December 1, 2009 **Component Type:** Third party extension. This extension is not a part of the TYPO3 default installation. **Affected Versions:** Version 1.2.0 and all versions below **Vulnerability Type:** Blind SQL Injection **Severity:** High **Problem Description:** Failing to filter user input the extension is open to Blind SQL Injection. The vulnerability allows remote website users to execute arbitrary commands on the TYPO3 database. **Solution:** An updated version 1.2.1 is available from the TYPO3 extension manager and at . Users of the extension are advised to update the extension as soon as possible. **Credits:** Credits go to Michael Tschannen who discovered and reported the issue. **General advice:** Follow the recommendations that are given in the [TYPO3 Security Cookbook](http://typo3.org/fileadmin/security-team/typo3_security_cookbook_v-0.5.pdf). Please subscribe to the [typo3-announce mailing list](http://lists.typo3.org/cgi-bin/mailman/listinfo/typo3-announce) to receive future Security Bulletins via E-mail. ![](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)