The jh_captcha extension through 2.1.3, and 3.x through 3.0.2, for TYPO3 allows XSS.
Source: https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-15514
Reference (s):
- https://typo3.org/security/advisory/typo3-ext-sa-2020-012
- https://typo3.org/help/security-advisories