{"id":"CVE-2021-28976","url":"https://www.cyber-defence.io/tools/cve/CVE-2021-28976","generatedAt":"2026-10-27T20:23:00.061Z","title":"Remote Code Execution vulnerability in GetSimpleCMS before 3.3.16 in admin/upload.php via phar filess.","description":"Remote Code Execution vulnerability in GetSimpleCMS before 3.3.16 in admin/upload.php via phar filess.","published":"2021-06-23T13:15:08.000Z","lastModified":"2026-06-17T03:47:07.000Z","status":"Modified","sourceIdentifier":"cve@mitre.org","cvss":{"version":"3.1","score":7.2,"severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H"},"cwe":["CWE-434"],"affected":["get-simple/getsimplecms"],"epss":{"score":0.07548,"percentile":0.94474,"date":"2026-10-26","history":[]},"kev":{"listed":false},"exploits":{"count":1,"verified":false,"firstPublished":"2025-04-11","source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[{"edbId":52168,"kind":"exploit","title":"GetSimpleCMS 3.3.16 - Remote Code Execution (RCE)","url":"https://www.exploit-db.com/exploits/52168","sourceUrl":"https://gitlab.com/exploit-database/exploitdb/-/blob/main/exploits/php/webapps/52168.txt","file":"exploits/php/webapps/52168.txt","published":"2025-04-11","added":"2025-04-11","updated":"2025-04-13","author":"CodeSecLab","type":"webapps","platform":"php","port":null,"verified":false,"codes":["CVE-2021-28976"],"tags":null,"aliases":null,"applicationUrl":null,"screenshotUrl":null,"referenceUrl":null}]},"verdict":{"level":"urgent","text":"A public exploit is published in Exploit-DB and the impact is high, while EPSS rates exploitation at 7.5%. Anyone can run this; patch or mitigate before the next change window and check exposed instances for signs of use."},"changes":[],"references":[{"url":"https://github.com/GetSimpleCMS/GetSimpleCMS/issues/1335","tags":["Third Party Advisory"],"source":"cve@mitre.org"},{"url":"https://github.com/GetSimpleCMS/GetSimpleCMS/issues/1335","tags":["Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2021-28976","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."}