Weblate is a web based localization tool. Prior to version 5.17.1, the Markdown renderer used in user comments and other user-provided content didn't properly sanitize some attributes. This issue has been patched in version 5.17.1.
https://github.com/WeblateOrg/weblate/security/advisories/GHSA-5cmv-3rc4-7279
https://github.com/WeblateOrg/weblate/releases/tag/weblate-5.17.1
https://github.com/WeblateOrg/weblate/pull/19259
https://github.com/WeblateOrg/weblate/commit/85abc9df88b7464f4c0e794aef752e45f4230f75