{"action":"No fix published. Pin and monitor.","affected":[{"introduced":"0","last_affected":"3.2.0"}],"component":"github.com/oauth2-proxy/oauth2-proxy","cve_ids":["CVE-2021-21291"],"ecosystem":"Go","epss":0.01595,"exploited":false,"fixed_versions":[],"ghsa_id":"GHSA-4mf2-f3wh-gvf2","id":"tcs_01M5KEWVZ3ZCCBYTE0D8FK28G8","modified_at":"2026-09-10T03:49:04.327848096Z","published_at":"2021-05-25T18:42:20Z","references":["https://osv.dev/vulnerability/GHSA-4mf2-f3wh-gvf2","https://github.com/oauth2-proxy/oauth2-proxy/security/advisories/GHSA-4mf2-f3wh-gvf2","https://nvd.nist.gov/vuln/detail/CVE-2021-21291","https://github.com/oauth2-proxy/oauth2-proxy/commit/780ae4f3c99b579cb2ea9845121caebb6192f725","https://github.com/oauth2-proxy/oauth2-proxy/releases/tag/v7.0.0","https://pkg.go.dev/github.com/oauth2-proxy/oauth2-proxy/v7"],"severity":{"label":"medium","score":5.4},"sources":[{"source":"osv","source_id":"GHSA-4mf2-f3wh-gvf2#Go/github.com/oauth2-proxy/oauth2-proxy","url":"https://osv.dev/vulnerability/GHSA-4mf2-f3wh-gvf2"}],"summary":"Subdomain checking of whitelisted domains could allow unintended redirects in oauth2-proxy"}