{"id":"CVE-2026-119567","kind":"vulnerability","aliases":["CVE-2026-119567"],"related":[],"title":"vsftpd: X-prefixed FTP aliases bypass denied-command checks after login","description":"vsftpd through 3.0.5 contains an access control bypass vulnerability that allows authenticated FTP users to execute denied commands by issuing RFC 775 X-prefixed aliases. The cmds_denied check in process_post_login() compares literal tokens, so attackers can send XRMD, XMKD, XCWD, XPWD, or XCUP to perform blocked operations like deleting directories.","summary":"vsftpd through 3.0.5 checks denied FTP commands by literal name, so an authenticated user can send legacy X-prefixed aliases such as XRMD or XMKD to run them anyway. The attacker gets the blocked operations the server was configured to refuse, such as deleting directories.","severity":"low","cvss":3.1,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["ftp","infrastructure","self-hosted","vsftpd"],"not_affected_if":["anonymous-only","newer-than-3.0.5","no-cmds-denied"],"how_to_check":"- Run `vsftpd -v` or check the installed package version; the sources list `3.0.5` and earlier as affected.\n- Look for `cmds_denied` in the vsftpd configuration file (commonly `/etc/vsftpd.conf`); the bypass only matters if this restriction is in use.","fix":null,"status":"open","published_at":"2026-10-30T12:16:44+00:00","first_seen_at":"2026-10-30T12:30:26+00:00","triaged_at":"2026-10-30T12:34:08+00:00","updated_at":"2026-10-30T12:34:08+00:00","category":"infrastructure","confidence":0.6,"triage":{"at":"2026-10-30T12:34:08Z","model":"claude-haiku-5-5","output":{"fix":"unknown","reach":"network","title":"vsftpd: X-prefixed FTP aliases bypass denied-command checks after login","impact":"medium","summary":"vsftpd through 3.0.5 checks denied FTP commands by literal name, so an authenticated user can send legacy X-prefixed aliases such as XRMD or XMKD to run them anyway. The attacker gets the blocked operations the server was configured to refuse, such as deleting directories.","audience":"businesses","category":"infrastructure","nicknames":[],"who_cares":["vsftpd","ftp","self-hosted"],"confidence":0.6,"fix_status":"unknown","needs_auth":"yes","worst_case":"authenticated user performs denied directory deletions and other blocked commands","analyst_note":"Confirm whether a vsftpd release newer than 3.0.5 fixes this and check the NVD entry for the fixed version.","how_to_check":"- Run `vsftpd -v` or check the installed package version; the sources list `3.0.5` and earlier as affected.\n- Look for `cmds_denied` in the vsftpd configuration file (commonly `/etc/vsftpd.conf`); the bypass only matters if this restriction is in use.","plain_action":"","needs_analyst":true,"not_affected_if":["no-cmds-denied","anonymous-only","newer-than-3.0.5"],"who_is_affected":"Only servers running vsftpd through 3.0.5 that rely on the cmds_denied setting to block FTP commands for logged-in users. Anonymous-only servers and setups that do not use cmds_denied are not exposed through this flaw. The sources do not name a fixed release.","user_interaction":"no","needs_special_setup":"yes","severity_if_unknown":"low"},"cost_usd":0.00072,"input_tokens":4161,"output_tokens":608,"severity_before":"low"},"analyst_status":null,"analyst_note":null,"search":"'-119567':16A,19A '-2026':15A,18A '3.0.5':28B,74C '775':93C 'access':77C 'alias':6A,46B,97C 'allow':82C 'anyway':55B 'attack':57B,110C 'authent':38B,83C 'block':60B,121C 'bypass':7A,79C 'check':11A,29B,101C 'cmds':99C 'command':10A,32B,89C 'compar':106C 'configur':65B 'contain':75C 'control':78C 'cve':14A,17A 'delet':70B,124C 'deni':9A,30B,88C,100C 'denied-command':8A 'directori':71B,125C 'execut':87C 'ftp':5A,20B,31B,84C 'get':58B 'host':24B 'infrastructur':21B 'issu':91C 'legaci':42B 'like':123C 'liter':34B,107C 'login':13A,105C 'name':35B 'oper':61B,122C 'perform':120C 'post':104C 'prefix':4A,45B,96C 'process':103C 'refus':67B 'rfc':92C 'run':53B 'self':23B 'self-host':22B 'send':41B,112C 'server':63B 'token':108C 'user':39B,85C 'vsftpd':1A,25B,26B,72C 'vulner':80C 'x':3A,44B,95C 'x-prefix':2A,43B,94C 'xcup':118C 'xcwd':115C 'xmkd':51B,114C 'xpwd':116C 'xrmd':49B,113C","nicknames":[],"mitigations":[],"who_affected":"Only servers running vsftpd through 3.0.5 that rely on the cmds_denied setting to block FTP commands for logged-in users. Anonymous-only servers and setups that do not use cmds_denied are not exposed through this flaw. The sources do not name a fixed release.","tier":"C","verified":{},"analyst_revisit_at":null,"fix_status":"none","audience":"businesses","plain_action":null,"first_public_at":"2026-10-30T12:16:44+00:00","kev":null,"cvss_vector":"CVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:N/VC:N/VI:L/VA:N/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","cvss_by":"disclosure@vulncheck.com","poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-119567","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-119567","severity":null,"published_at":"2026-10-30T12:16:44+00:00","modified_at":"2026-10-30T12:16:44+00:00","first_seen_at":"2026-10-30T12:30:26+00:00","fetched_at":"2026-10-30T12:30:26+00:00","note":null}],"documents":[],"notice":"Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai"}