--- title: "TYPO3-EXT-SA-2021-006: Server-side request forgery in extension \"Yoast SEO for TYPO3\" (yoast_seo)" url: "https://news.typo3.com/security/advisory/typo3-ext-sa-2021-006" description: "It has been discovered that the extension \"Yoast SEO for TYPO3\" (yoast_seo) is susceptible to Server-side request forgery (SSRF)." 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-2021-006: Server-side request forgery in extension "Yoast SEO for TYPO3" (yoast_seo) - [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-2021-006: Server-side request forgery in extension "Yoast SEO for TYPO3" (yoast\_seo) ================================================================================================== 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 "Yoast SEO for TYPO3" (yoast\_seo) is susceptible to Server-side request forgery (SSRF). - ![](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: "Yoast SEO for TYPO3" (yoast\_seo) - Vulnerability Type: Server-side request forgery - Affected Versions: 7.2.0 and below - 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-2021-31779](https://nvd.nist.gov/vuln/detail/CVE-2021-31779) ### Problem Description The extension fails to restrict analyzed URLs to domains managed by the current TYPO3 website. A logged in TYPO3 backend user can use the vulnerability to make HTTP requests to arbitrary domains including the webserver itself or other internally managed resources. ### Solution An updated version 7.2.1  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 MaxServ BV 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)