CVE-2026-53908: MCO is vulnerable to User Enumeration through authentication-related functionalities

Routine

MEDIUM 4.3DOWNGRADE

CVE-2026-53908 is a medium-severity flaw (CVSS 4.3) affecting mycomplianceoffice. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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 oth

Why this priority

No elevated risk signals yet

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	4.3 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.4% (top 70%)
CISA exploited list	No
Weakness	CWE-204
Published	2026-07-01
Last modified	2026-10-25

Publisher (CNA): CERT.PL · Vendor: mycomplianceoffice

Last updated 2026-10-25 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-07-01 13:17 UTCPublished CVE record published
2026-10-25 17:10 UTCUpdated Record last modified

mycomplianceoffice mycomplianceoffice DOWNGRADE

Affected: 25.3.3.1

Fixed in: no fixed release known

Safe to downgrade to: a release before 25.3.3.1

1. Check installed version

apt-cache policy mycomplianceoffice || rpm -q mycomplianceoffice || mycomplianceoffice --version

2. No fixed release: DOWNGRADE to a release before 25.3.3.1 (Debian / Ubuntu)

apt-cache madison mycomplianceoffice sudo apt install mycomplianceoffice=<VERSION_BEFORE_25.3.3.1> sudo apt-mark hold mycomplianceoffice

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list mycomplianceoffice sudo dnf downgrade mycomplianceoffice-<VERSION_BEFORE_25.3.3.1> sudo dnf versionlock add mycomplianceoffice

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-53908?

mycomplianceoffice: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2026-53908 being exploited?

CVE-2026-53908 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-53908 affect?

CVE-2026-53908 affects mycomplianceoffice. Severity is medium (CVSS 4.3). 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 leve

How urgent is CVE-2026-53908?

Priority 22/100. No elevated risk signals yet.

Related CVEs

CVE-2026-53906 HIGH 8.2 DOWNGRADE MCO is vulnerable to Path Disclosure and Path Traversal in file handling functionality related to data export
CVE-2026-53903 HIGH 8.1 DOWNGRADE MCO is vulnerable to an Insecure Direct Object Reference (IDOR) vulnerability in the /customer/servlet/mco/web
CVE-2026-53905 HIGH 7.1 DOWNGRADE MCO does not properly enforce authorization checks in the /customer/servlet/mco/webapi/admin-view-hierarchy/ge
CVE-2026-53909 MEDIUM 6.5 DOWNGRADE MCO does not correctly validate types of uploaded files
CVE-2026-53902 MEDIUM 6.5 DOWNGRADE MCO does not properly enforce authorization checks in the /customer/servlet/mco/webapi/profile-sections/group-

References

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