--- title: "TYPO3-EXT-SA-2021-004: Cross-Site Scripting in extension \"2 Clicks for External Media\" (media2click)" url: "https://news.typo3.com/security/advisory/typo3-ext-sa-2021-004" description: "It has been discovered that the extension \"2 Clicks for External Media\" (media2click) is susceptible to Cross-Site Scripting." 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-2021-004: Cross-Site Scripting in extension "2 Clicks for External Media" (media2click) - [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-2021-004: Cross-Site Scripting in extension "2 Clicks for External Media" (media2click) ==================================================================================================== 27 April 2021 ![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 "2 Clicks for External Media" (media2click) is susceptible to Cross-Site Scripting. - ![](https://news.typo3.com/typo3temp/assets/t3g/blog/gravatar/e4eaa13e33dd086a9c06f2570cb34609.jpeg)[Torben Hansen](https://news.typo3.com/article/author/torben-hansen) - Release Date: April 27, 2021 - Component Type: Third party extension. This extension is not a part of the TYPO3 default installation. - Component: "2 Clicks for External Media" (media2click) - Vulnerability Type: Cross-Site Scripting - Affected Versions: 1.0.0 - 1.3.2 - Severity: Medium - Suggested CVSS: [CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/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:C/C:L/I:N/A:N/E:F/RL:O/RC:C&version=3.1) - References: [CVE-2021-31778](https://nvd.nist.gov/vuln/detail/CVE-2021-31778) ### Problem Description The extension fails to properly encode user input for output in HTML context. A TYPO3 backend user account is required to exploit the vulnerability. ### Solution An updated version 1.3.3  is 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 Andrey Basarygin, Andrey Guzei, Mikhail Khramenkov, Alexander Sidukov and Maxim Teplykh from Solar Security  for reporting the issue and to Gregor Hermens 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)