--- title: "TYPO3-EXT-SA-2020-008: Cross-Site Scripting in \"SVG Sanitizer\" (svg_sanitizer)" url: "https://news.typo3.com/security/advisory/typo3-ext-sa-2020-008" description: "It has been discovered that the extension \"SVG Sanitizer\" (svg_sanitizer) is vulnerable 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-2020-008: Cross-Site Scripting in "SVG Sanitizer" (svg_sanitizer) - [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-2020-008: Cross-Site Scripting in "SVG Sanitizer" (svg\_sanitizer) =============================================================================== 12 May 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 "SVG Sanitizer" (svg\_sanitizer) is vulnerable to Cross-Site Scripting. - ![](https://news.typo3.com/typo3temp/assets/t3g/blog/gravatar/b8266fdc667b773926c59081862ab148.jpeg)[Oliver Hader](https://news.typo3.com/article/author/oliver-hader) - Release Date: May 12, 2020 - Component Type: Third party extension. This extension is not a part of the TYPO3 default installation. - Component: SVG Sanitizer (ext:svg\_sanitizer) - Vulnerability Type: Cross-Site Scripting - Affected Versions: 1.0.2 and below - Severity: Medium - Suggested CVSS v3.1: [AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/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:R/S:C/C:L/I:L/A:N/E:F/RL:O/RC:C&version=3.1) - References: [CVE-2020-11070](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-11070), CWE-79 ### Problem Description Slightly invalid or incomplete SVG markup is not correctly processed and thus not sanitized at all. Albeit the markup is not valid it is still evaluated in browsers can lead to Cross-Site Scripting. ### Solution An updated version 1.0.3 is available from the TYPO3 extension manager and at Users of the extension are advised to update the extension as soon as possible. ### Credits Thanks to Matteo Bonaker who reported this issue and to TYPO3 merger Frank Nägler who fixed the issue. ### 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/cc7cba9757f98fbe05023a139119df74.jpeg) About the Author [Oliver Hader](https://news.typo3.com/article/author/oliver-hader) Core Developer at TYPO3 GmbH,Hof, Germany [Website](https://typo3.com)[Twitter](https://twitter.com/ohader)[LinkedIn](https://www.linkedin.com/in/oliverhader/)[Xing](https://www.xing.com/profile/Oliver_Hader) Oliver started to work with TYPO3 in 2005 and was fascinated by the product and its universe. Since 2007 he is member of the TYPO3 Core Team. After going back to university in 2014 for achieving a postgraduate master degree in internet web science, he is now researching on advanced web technology topics in general and for TYPO3 in particular. In his spare time, Oliver loves to go cycling cross-country in the uplands around Hof (Germany) in northern Bavaria - at the region where he's living as well. [More posts by this author](https://news.typo3.com/article/author/oliver-hader)