--- title: "TYPO3-EXT-SA-2020-012: Cross-Site Scripting in extension \"Google reCAPTCHA (v2/v3)\" (jh_captcha)" url: "https://news.typo3.com/security/advisory/typo3-ext-sa-2020-012" description: "It has been discovered that the extension \"Google reCAPTCHA (v2/v3)\" (jh_captcha) 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-2020-012: Cross-Site Scripting in extension "Google reCAPTCHA (v2/v3)" (jh_captcha) - [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-2020-012: Cross-Site Scripting in extension "Google reCAPTCHA (v2/v3)" (jh\_captcha) ================================================================================================= 07 July 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 "Google reCAPTCHA (v2/v3)" (jh\_captcha) 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: July 07, 2020 - Component Type: Third party extension. This extension is not a part of the TYPO3 default installation. - Component: Google reCAPTCHA (v2/v3) (jh\_captcha) - Vulnerability Type: Cross-Site Scripting - Affected Versions: 3.0.2 - 3.0.0 and 2.1.3 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-2020-15514](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-15514) ### Problem Description The extension fails to properly encode user input for output in HTML context. The issue is only exploitable by backend users with access to TypoScript settings of the extension. ### Solution Updated versions 2.1.4 and 3.0.3 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 Sven Jürgens  for discovering and reporting the vulnerability and to Jan Haffner 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)