{"id":"CVE-2020-37023","url":"https://www.cyber-defence.io/tools/cve/CVE-2020-37023","generatedAt":"2026-10-28T02:58:25.864Z","title":"Koken CMS 0.22.24 contains a file upload vulnerability that allows authenticated attackers to bypass file extension restrictions by renaming malicious PHP files.","description":"Koken CMS 0.22.24 contains a file upload vulnerability that allows authenticated attackers to bypass file extension restrictions by renaming malicious PHP files. Attackers can upload PHP files with system command execution capabilities by manipulating the file upload request through a web proxy and changing the file extension.","published":"2026-01-30T23:16:07.000Z","lastModified":"2026-06-17T03:16:47.000Z","status":"Deferred","sourceIdentifier":"disclosure@vulncheck.com","cvss":{"version":"4.0","score":8.7,"severity":"HIGH","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/M"},"cwe":["CWE-434"],"affected":[],"epss":{"score":0.00714,"percentile":0.53397,"date":"2026-10-26","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 (0.71%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit."},"changes":[],"references":[{"url":"http://koken.me/","source":"disclosure@vulncheck.com"},{"url":"https://github.com/V1n1v131r4/Bypass-File-Upload-on-Koken-CMS/blob/master/README.md","source":"disclosure@vulncheck.com"},{"url":"https://www.exploit-db.com/exploits/48706","source":"disclosure@vulncheck.com"},{"url":"https://www.softaculous.com/apps/cms/Koken","source":"disclosure@vulncheck.com"},{"url":"https://www.vulncheck.com/advisories/koken-cms-arbitrary-file-upload","source":"disclosure@vulncheck.com"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2020-37023","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."}