{"id":"CVE-2023-53979","aliases":["EUVD-2023-60241","GHSA-5639-746g-v626"],"status":"published","title":"MyBB 1.8.32 Authenticated Remote Code Execution via Chained Vulnerabilities","description":"MyBB 1.8.32 contains a chained vulnerability that allows authenticated administrators to bypass avatar upload restrictions and execute arbitrary code. Attackers can modify upload path settings, upload a malicious PHP-embedded image file, and execute commands through the language configuration editing interface.","severity":{"version":"4.0","score":8.6,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-10","score":0.00818,"percentile":0.57466,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-22"],"published":"2025-12-22T21:35:35Z","modified":"2026-06-17T06:46:28Z","products":[{"vendor":"mybb","product":"mybb"}],"references":[{"url":"https://www.exploit-db.com/exploits/51213","tags":["exploit","Exploit"]},{"url":"https://mybb.com/","tags":["product","Product"]},{"url":"https://fdlucifer.github.io/2023/01/17/mybb1-8-32-LFI-RCE/","tags":["technical-description","Exploit","Third Party Advisory"]},{"url":"https://www.vulncheck.com/advisories/mybb-authenticated-remote-code-execution-via-chained-vulnerabilities","tags":["third-party-advisory","Exploit","Third Party Advisory"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2022-45867"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2023-53979"},{"url":"https://fdlucifer.github.io/2023/01/17/mybb1-8-32-LFI-RCE"},{"url":"https://mybb.com"},{"url":"https://github.com/advisories/GHSA-5639-746g-v626"}],"sources":{"cve":[{"id":"CVE-2023-53979","title":"MyBB 1.8.32 Authenticated Remote Code Execution via Chained Vulnerabilities","description":"MyBB 1.8.32 contains a chained vulnerability that allows authenticated administrators to bypass avatar upload restrictions and execute arbitrary code. Attackers can modify upload path settings, upload a malicious PHP-embedded image file, and execute commands through the language configuration editing interface.","status":"published","published":"2025-12-22T21:35:35.951Z","modified":"2026-03-05T12:03:23.604Z","cvss":[{"version":"4.0","score":8.6,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N","level":"high","assessor":"cna"},{"version":"3.1","score":8.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","level":"high","assessor":"cna"}],"cwes":["CWE-22"],"updated_at":"2026-11-02T14:35:30.851125Z"}],"euvd":[{"id":"EUVD-2023-60241","description":"MyBB 1.8.32 contains a chained vulnerability that allows authenticated administrators to bypass avatar upload restrictions and execute arbitrary code. Attackers can modify upload path settings, upload a malicious PHP-embedded image file, and execute commands through the language configuration editing interface.","status":"published","published":"2025-12-22T21:35:35Z","modified":"2026-03-05T12:03:23Z","cvss":[{"version":"4.0","score":8.6,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N","level":"high"}],"updated_at":"2026-11-02T19:48:09.383214Z"}],"ghsa":[{"id":"GHSA-5639-746g-v626","title":"MyBB 1.8.32 contains a chained vulnerability that allows authenticated administrators to bypass...","description":"MyBB 1.8.32 contains a chained vulnerability that allows authenticated administrators to bypass avatar upload restrictions and execute arbitrary code. Attackers can modify upload path settings, upload a malicious PHP-embedded image file, and execute commands through the language configuration editing interface.","status":"published","published":"2025-12-23T00:30:32Z","modified":"2025-12-27T21:30:12Z","cvss":[{"version":"4.0","score":8.6,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:H/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/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","level":"high"},{"version":"3.1","score":8.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","level":"high"}],"cwes":["CWE-22"],"updated_at":"2026-11-02T15:05:22.620437Z"}],"nvd":[{"id":"CVE-2023-53979","description":"MyBB 1.8.32 contains a chained vulnerability that allows authenticated administrators to bypass avatar upload restrictions and execute arbitrary code. Attackers can modify upload path settings, upload a malicious PHP-embedded image file, and execute commands through the language configuration editing interface.","status":"published","published":"2025-12-22T22:16:03.54Z","modified":"2026-06-17T06:46:28.443Z","cvss":[{"version":"4.0","score":8.6,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:H/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/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","level":"high","assessor":"secondary"},{"version":"3.1","score":8.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","level":"high","assessor":"secondary"}],"cwes":["CWE-22"],"updated_at":"2026-11-02T14:09:26.50087Z"}]}}