CVE-2026-53904
MediumCVSS 6.3Exploitation Probability (EPSS)
Low risk14th percentile — higher than 14% of all known CVEs
Summary
MCO is vulnerable to Account Denial of Service due to improper implementation of password reset functionality. Each password reset request invalidates previously set password as well as previously issued temporary passwords, and password resets are not limited. An attacker who provides victim's email and answer to their security question can successfully initiate the reset process and continuously invalidate credentials, effectively locking the victim out of their account.
Risk Assessment
The risk involves potential permanent lockout of user accounts, leading to service disruption and possible loss of access to critical resources. The limitation is the need to know the answer to the security question and the limited number of attempts to guess it.
Recommendation
It is recommended to immediately update to the latest version of MCO if available, or implement temporary mitigations such as limiting the number of password reset requests per account and strengthening identity verification mechanisms.
Original NVD description (English source)
MCO is vulnerable to Account Denial of Service due to improper implementation of password reset functionality. Each password reset request invalidates previously set password as well as previously issued temporary passwords, furthermore, password resets are not limited in any way. An attacker who provides victim's email and answer to their security question, can successfully initiate the reset process and continuously invalidate credentials, effectively locking the victim out of their account. Answering security questions has a limited number of tries which lowers the risk of this vulnerability. Because vendor contact attempts were unsuccessful, the vulnerability has only been confirmed in version 25.3.3.1 but may also affect other versions.