An issue was discovered in Tiny Tiny RSS (aka tt-rss) before 2020-09-16. The cached_url feature mishandles JavaScript inside an SVG document.
https://git.tt-rss.org/fox/tt-rss/commit/da5af2fae091041cca27b24b6f0e69e4a6d0dc60
https://community.tt-rss.org/t/heads-up-several-vulnerabilities-fixed/3799