CVE-2026-67193 Xlight FTP Server < 3.9.5 Information Disclosure via USER Command
Unauthenticated attackers can leak server timing information via a crafted USER command, potentially aiding further attacks.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-67193?
CVE-2026-67193 is a medium-severity vulnerability in Xlight FTP Server, published on 29 Jul 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Xlight FTP Server before 3.9.5 contains an information disclosure vulnerability that allows unauthenticated attackers to obtain the server's current GetTickCount() value by sending a USER command with a username ending in the :adm suffix. Attackers can trigger the admin protocol path within the standard FTP listener pre-authentication to leak timing information from the FTP 331 response without requiring a separate port or configuration change.
Weakness: CWE-203
Which versions are affected by CVE-2026-67193?
How do I fix CVE-2026-67193?
No fix has been published for CVE-2026-67193 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-67193 being exploited?
There is no known exploitation of CVE-2026-67193 in the wild and no public exploit code.
Sources
Also known as GHSA-3c72-cvwm-9gqx.