--- title: "TYPO3-EXT-SA-2020-017: Multiple vulnerabilities in extension \"Event management and registration\" (sf_event_mgt)" url: "https://news.typo3.com/security/advisory/typo3-ext-sa-2020-017" description: "It has been discovered that the extension \"Event management and registration\" (sf_event_mgt) is susceptible to Information Disclosure and Broken Access Control." image: "https://news.typo3.com/_assets/d1e01514e4c4a5b3147940fa2ec50682/Images/og-image-news.jpg" date: 2026-06-11 modified: 2026-06-11 categories: - "Developer & Technology" - TYPO3 Extensions --- # TYPO3-EXT-SA-2020-017: Multiple vulnerabilities in extension "Event management and registration" (sf_event_mgt) - [Developer & Technology](https://news.typo3.com/article/category/developer-technology) - Security / [TYPO3 Extensions](https://news.typo3.com/article/category/security/typo3-extensions) TYPO3-EXT-SA-2020-017: Multiple vulnerabilities in extension "Event management and registration" (sf\_event\_mgt) ================================================================================================================= 02 September 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 the extension "Event management and registration" (sf\_event\_mgt) is susceptible to Information Disclosure and Broken Access Control. - ![](https://news.typo3.com/typo3temp/assets/t3g/blog/gravatar/e4eaa13e33dd086a9c06f2570cb34609.jpeg)[Torben Hansen](https://news.typo3.com/article/author/torben-hansen) - Release Date: September 02, 2020 - Component Type: Third party extension. This extension is not a part of the TYPO3 default installation. - Component: Event management and registration (sf\_event\_mgt) - Vulnerability Type: Information Disclosure, Broken Access Control - Affected Versions: 4.3.0 and below, 5.0.0 - 5.1.0 - Severity: Medium - Suggested CVSS v3.1: [AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N/E:F/RL:O/RC:C](https://nvd.nist.gov/vuln-metrics/cvss/v3-calculator?vector=AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N/E:F/RL:O/RC:C&version=3.1) - References: [CVE-2020-25026](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-25026) ### Problem Description A missing access check in the backend module allows an authenticated backend user to export participant data for events which the user does not have access to, resulting in Information Disclosure. Another missing access check in the backend module allows an authenticated backend user to send emails to event participants for events which the user does not have access to, resulting in Broken Access Control. ### Solution Updated versions 4.3.1 and 5.1.1 are available from the TYPO3 extension manager, Packagist and at Users of the extension are advised to update the extension as soon as possible. ### Credits Thanks to TYPO3 security team member Torben Hansen for providing an updated version of the extension. ### General Advice Follow the recommendations that are given in the [TYPO3 Security Guide](https://docs.typo3.org/typo3cms/CoreApiReference/Security/Index.html#security-guidelines). Please subscribe to the [typo3-announce](http://lists.typo3.org/cgi-bin/mailman/listinfo/typo3-announce) mailing list. ![](https://news.typo3.com/typo3temp/assets/t3g/blog/gravatar/7cf52722a5b7183b29d378a2284bd103.jpeg) About the Author [Torben Hansen](https://news.typo3.com/article/author/torben-hansen) Open Source Enthusiast & TYPO3 Expert I’m a passionate open-source advocate and dedicated TYPO3 expert. As a freelancer, I offer professional TYPO3 services to clients while actively contributing to the TYPO3 ecosystem. I have developed several public TYPO3 extensions and serve as the Co-Lead of the TYPO3 Security Team, helping to enhance the platform’s security and functionality. For many years, I have been blogging about TYPO3, sharing insights and expertise with the community. [More posts by this author](https://news.typo3.com/article/author/torben-hansen)