{"id":"CVE-2011-10018","aliases":["EUVD-2011-5246","GHSA-4whv-mhhp-7qcj"],"status":"published","title":"myBB 1.6.4 Backdoor Arbitrary Command Execution","description":"myBB version 1.6.4 was distributed with an unauthorized backdoor embedded in the source code. The backdoor allowed remote attackers to execute arbitrary PHP code by injecting payloads into a specially crafted collapsed cookie. This vulnerability was introduced during packaging and was not part of the intended application logic. Exploitation requires no authentication and results in full compromise of the web server under the context of the web application.","severity":{"version":"4.0","score":10,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H","level":"critical","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-06","score":0.03024,"percentile":0.87523,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":true,"fix_available":false},"cwes":["CWE-912","CWE-94"],"published":"2025-08-13T20:35:31Z","modified":"2026-06-16T23:28:28Z","exploits":[{"source":"metasploit","id":"exploit/unix/webapp/mybb_backdoor","title":"myBB 1.6.4 Backdoor Arbitrary Command Execution","type":"exploit","platform":"PHP","date":"2011-10-06","verified":true,"url":"https://www.rapid7.com/db/modules/exploit/unix/webapp/mybb_backdoor"}],"products":[{"vendor":"mybb","product":"mybb"},{"vendor":"mybb group","product":"forum software"}],"references":[{"url":"https://raw.githubusercontent.com/rapid7/metasploit-framework/master/modules/exploits/unix/webapp/mybb_backdoor.rb","tags":["exploit","Product"]},{"url":"https://www.exploit-db.com/exploits/17949","tags":["exploit","Exploit"]},{"url":"https://web.archive.org/web/20111015224948/http://secunia.com/advisories/46300/","tags":["third-party-advisory","Third Party Advisory"]},{"url":"https://blog.mybb.com/2011/10/06/1-6-4-security-vulnerabilit/","tags":["vendor-advisory","patch","Vendor Advisory"]},{"url":"https://www.vulncheck.com/advisories/mybb-backdoor-arbitrary-command-execution","tags":["third-party-advisory","Third Party Advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2011-10018"},{"url":"https://blog.mybb.com/2011/10/06/1-6-4-security-vulnerabilit"},{"url":"https://web.archive.org/web/20111015224948/http://secunia.com/advisories/46300"},{"url":"https://github.com/advisories/GHSA-4whv-mhhp-7qcj"}],"sources":{"cve":[{"id":"CVE-2011-10018","title":"myBB 1.6.4 Backdoor Arbitrary Command Execution","description":"myBB version 1.6.4 was distributed with an unauthorized backdoor embedded in the source code. The backdoor allowed remote attackers to execute arbitrary PHP code by injecting payloads into a specially crafted collapsed cookie. This vulnerability was introduced during packaging and was not part of the intended application logic. Exploitation requires no authentication and results in full compromise of the web server under the context of the web application.","status":"published","published":"2025-08-13T20:35:31.755Z","modified":"2026-04-07T14:02:09.269Z","cvss":[{"version":"4.0","score":10,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H","level":"critical","assessor":"cna"}],"cwes":["CWE-912","CWE-94"],"updated_at":"2026-11-02T14:35:36.252742Z"}],"euvd":[{"id":"EUVD-2011-5246","description":"myBB version 1.6.4 was distributed with an unauthorized backdoor embedded in the source code. The backdoor allowed remote attackers to execute arbitrary PHP code by injecting payloads into a specially crafted collapsed cookie. This vulnerability was introduced during packaging and was not part of the intended application logic. Exploitation requires no authentication and results in full compromise of the web server under the context of the web application.","status":"published","published":"2025-08-13T20:35:31Z","modified":"2026-04-07T14:02:09Z","cvss":[{"version":"4.0","score":10,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H","level":"critical"}],"updated_at":"2026-11-02T19:25:14.820353Z"}],"ghsa":[{"id":"GHSA-4whv-mhhp-7qcj","title":"myBB version 1.6.4 was distributed with an unauthorized backdoor embedded in the source code. The...","description":"myBB version 1.6.4 was distributed with an unauthorized backdoor embedded in the source code. The backdoor allowed remote attackers to execute arbitrary PHP code by injecting payloads into a specially crafted collapsed cookie. This vulnerability was introduced during packaging and was not part of the intended application logic. Exploitation requires no authentication and results in full compromise of the web server under the context of the web application.","status":"published","published":"2025-08-13T21:30:30Z","modified":"2025-08-14T18:32:30Z","cvss":[{"version":"4.0","score":10,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","level":"critical"},{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical"}],"cwes":["CWE-94"],"updated_at":"2026-11-02T15:03:17.959289Z"}],"nvd":[{"id":"CVE-2011-10018","description":"myBB version 1.6.4 was distributed with an unauthorized backdoor embedded in the source code. The backdoor allowed remote attackers to execute arbitrary PHP code by injecting payloads into a specially crafted collapsed cookie. This vulnerability was introduced during packaging and was not part of the intended application logic. Exploitation requires no authentication and results in full compromise of the web server under the context of the web application.","status":"published","published":"2025-08-13T21:15:29.387Z","modified":"2026-06-16T23:28:28.753Z","cvss":[{"version":"4.0","score":10,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","level":"critical","assessor":"secondary"},{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical","assessor":"primary"}],"cwes":["CWE-94","CWE-912"],"updated_at":"2026-11-02T14:02:12.945371Z"}]}}