CVE-2026-53908

mediumCVSS 4.3covered by 1 sourcefirst seen 2026-07-01

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.

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Exploitation outlook

Low exploitation risk0.21% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 11% of all EPSS-scored CVEs.

Advisory coverage (1)

mediumCVE-2026-53908: MCO is vulnerable to User Enumeration through authentication-related functionalities. The appl…nvd · 2026-07-01

External references

NVD record for CVE-2026-53908

CVE.org record

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