CVE-2026-53904

HIGH

Mycomplianceoffice Mco < 25.3.3.1 - Denial of Service

Title source: rule
STIX 2.1

Exploitation Summary

EIP tracks 1 public exploit for CVE-2026-53904. PoCs published by HermesNA-1.

AI-analyzed exploit summary This repository contains an auto-generated stub module for CVE-2026-53904, a denial-of-service vulnerability in MCO's password reset functionality. The code includes placeholder logic for probing a target but lacks actual exploit implementation, referencing external sources for 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.

Exploits (1)

github STUB 1 stars
by HermesNA-1 · pythonpoc
https://github.com/HermesNA-1/SnakeSploit/tree/main/data/modules_generated/cve-2026-53904_mco_vulnerable.py

This repository contains an auto-generated stub module for CVE-2026-53904, a denial-of-service vulnerability in MCO's password reset functionality. The code includes placeholder logic for probing a target but lacks actual exploit implementation, referencing external sources for details.

Classification
Stub 99%
Attack Type
Dos
Complexity
Moderate
Reliability
Theoretical
Target: MCO (MyComplianceOffice)
No auth needed
Prerequisites: Network access to the MCO password reset endpoint · Valid user account email/identifier for targeting
mistral-large-3 · analyzed Jul 09, 2026 Full analysis →

References (2)

Core 2
Core References
Third Party Advisory third-party-advisory
https://cert.pl/en/posts/2026/07/CVE-2026-53902

Scores

CVSS v3 7.1
EPSS 0.0020
EPSS Percentile 10.5%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:H

CISA SSVC

Vulnrichment
Exploitation none
Automatable no
Technical Impact partial

Details

CWE
CWE-307 CWE-640
Status published
Products (2)
mycomplianceoffice/mco 25.3.3.1
MyComplianceOffice/MCO 25.3.3.1
Published Jul 01, 2026
Tracked Since Jul 01, 2026