CVE-2026-53904 Details
Description
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.
A denial-of-service vulnerability has been identified in MyComplianceOffice (MCO) version 25.3.3.1, stemming from an improper implementation of the password reset functionality. The flaw allows an attacker to continuously invalidate a victim's password and temporary passwords, effectively locking them out of their account. This is achieved by providing the victim's email and the answer to their security question. The vulnerability is exacerbated by the fact that there are no limits on the number of password reset requests that can be made.
Metrics
CVSS 4.0 Severity and Vector Strings:
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
CISA-ADP
Assessed Jul 1, 2026References to Advisories, Solutions, and Tools
By selecting these links, you will be leaving this site. These are references gathered from the official CVE record and are not endorsed by Volerion.
| URL | Source(s) | Tag(s) |
|---|---|---|
| https://cert.pl/en/posts/2026/07/CVE-2026-53902 | [email protected] | Third Party Advisory |
| https://mco.mycomplianceoffice.com/ | [email protected] | Product |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-307 | Improper Restriction of Excessive Authentication Attempts | [email protected] |
| CWE-640 | Weak Password Recovery Mechanism for Forgotten Password | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| mycomplianceoffice mco | 25.3.3.1 |
CPE
Remediation
| |
Change History
3 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jul 6, 2026 | Initial Analysis | [email protected] |
| Jul 1, 2026 | CVE Modified | CISA-ADP |
| Jul 1, 2026 | New CVE Received | [email protected] |