CVE-2026-53908 User Enumeration in MCO
Attackers can enumerate valid usernames and emails via distinguishable responses in authentication flows, exposing user data.
- 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-2026-53908?
CVE-2026-53908 is a medium-severity vulnerability in MyComplianceOffice MCO, published on 1 Jul 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
MCO is vulnerable to User Enumeration through authentication-related functionalities. The application returns distinguishable responses for valid and invalid users during username reminder and password reset operations. An attacker can leverage these differences to enumerate valid usernames and email addresses.
Because vendor contact attempts were unsuccessful, the vulnerability has only been confirmed in version 25.3.3.1 but may also affect other versions.
Weakness: CWE-204
Which versions are affected by CVE-2026-53908?
It affects 1 product.
Products include Mycomplianceoffice Mycomplianceoffice.
How do I fix CVE-2026-53908?
No fix has been published for CVE-2026-53908 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-53908 being exploited?
There is no known exploitation of CVE-2026-53908 in the wild and no public exploit code.
Other vulnerabilities in MyComplianceOffice MCO
Sources
Also known as GHSA-59mp-p3m2-6wr7.