CVE-2026-53905Network attack vector

Administrator ACL disclosure via missing endpoint authorization

Published Jul 1, 2026 · Updated Jul 1, 2026

Incorrect authorization in MyComplianceOffice MCO 25.3.3.1 allows remote authenticated users to retrieve administrator ACL structures. The get-acl-tree-structure endpoint returns the administrator access-control hierarchy without verifying that the requesting account has administrator privileges. Low-privileged access is sufficient, exposing sensitive permission mappings and internal configuration details; effects beyond disclosure are not reported.

CVSS severity5.3
Medium
EPSS probability0.32%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Incorrect authorization in MyComplianceOffice MCO 25.3.3.1 allows remote authenticated users to retrieve administrator ACL structures. The get-acl-tree-structure endpoint returns the administrator access-control hierarchy without verifying that the requesting account has administrator privileges. Low-privileged access is sufficient, exposing sensitive permission mappings and internal configuration details; effects beyond disclosure are not reported.

The record

CVE
CVE-2026-53905
Published
Jul 1, 2026
Updated
Jul 1, 2026
Vendor
MyComplianceOffice
Product
MCO
Classifications
CWE-863
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 1, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 1, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=25.3.3.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

MyComplianceOffice · MCOversion=25.3.3.1

Published CVSS scores

7.1NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:N
5.3CERT.PLCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-863Incorrect Authorization

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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