---
id: "CVE-2026-119567"
kind: "vulnerability"
aliases: ["CVE-2026-119567"]
title: "vsftpd: X-prefixed FTP aliases bypass denied-command checks after login"
severity: "low"
cvss: 3.1
epss: null
exploited: false
status: "open"
category: "infrastructure"
products: []
ecosystems: []
tags: ["ftp", "infrastructure", "self-hosted", "vsftpd"]
not_affected_if: ["anonymous-only", "newer-than-3.0.5", "no-cmds-denied"]
published_at: "2026-10-30T12:16:44+00:00"
first_seen_at: "2026-10-30T12:30:26+00:00"
updated_at: "2026-10-30T12:34:08+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-119567", "first_seen_at": "2026-10-30T12:30:26+00:00"}]
---

# vsftpd: X-prefixed FTP aliases bypass denied-command checks after login

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.

_Summary, check and fix written by a model from the sources; labelled as such._

## How to check

- Run `vsftpd -v` or check the installed package version; the sources list `3.0.5` and earlier as affected.
- Look for `cmds_denied` in the vsftpd configuration file (commonly `/etc/vsftpd.conf`); the bypass only matters if this restriction is in use.

## Timeline

- 2026-10-30T12:30:26+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-119567

## From the sources

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.

---

_Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai_