{"id":"CVE-2017-20146","url":"https://www.cyber-defence.io/tools/cve/CVE-2017-20146","generatedAt":"2026-10-28T19:47:15.143Z","title":"Usage of the CORS handler may apply improper CORS headers, allowing the requester to explicitly control the value of the Access-Control-Allow-Origin header, which bypasses the expected behavior of the Same Origin Policy.","description":"Usage of the CORS handler may apply improper CORS headers, allowing the requester to explicitly control the value of the Access-Control-Allow-Origin header, which bypasses the expected behavior of the Same Origin Policy.","published":"2022-12-27T22:15:11.000Z","lastModified":"2026-06-17T01:15:16.000Z","status":"Modified","sourceIdentifier":"security@golang.org","cvss":{"version":"3.1","score":9.8,"severity":"CRITICAL","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"},"cwe":["CWE-346"],"affected":["gorillatoolkit/handlers"],"epss":{"score":0.00765,"percentile":0.55248,"date":"2026-10-27","history":[]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"high","text":"High impact if exploited, but EPSS currently rates exploitation as unlikely (0.77%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit."},"changes":[],"references":[{"url":"https://github.com/gorilla/handlers/commit/90663712d74cb411cbef281bc1e08c19d1a76145","tags":["Patch","Third Party Advisory"],"source":"security@golang.org"},{"url":"https://github.com/gorilla/handlers/pull/116","tags":["Patch","Third Party Advisory"],"source":"security@golang.org"},{"url":"https://pkg.go.dev/vuln/GO-2020-0020","tags":["Third Party Advisory"],"source":"security@golang.org"},{"url":"https://github.com/gorilla/handlers/commit/90663712d74cb411cbef281bc1e08c19d1a76145","tags":["Patch","Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://github.com/gorilla/handlers/pull/116","tags":["Patch","Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://pkg.go.dev/vuln/GO-2020-0020","tags":["Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2017-20146","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}