Joplin is a free, open source note taking and to-do application. Joplin fails to take into account that "<" followed by a non letter character will not be considered html. As such it is possible to do an XSS by putting an "illegal" tag within a tag.
- https://github.com/laurent22/joplin/security/advisories/GHSA-g796-3g6g-jmmc
- https://github.com/fkie-cad/nvd-json-data-feeds