CVE-2026-53903Network attack vector

Authenticated document disclosure via unchecked object identifier

Published Jul 1, 2026 · Updated Jul 1, 2026

Authorization bypass in MyComplianceOffice MCO 25.3.3.1 allows remote authenticated users to read other users' trading documents. The fetchPdfStatement endpoint retrieves a PDF using a user-supplied document identifier without verifying that the requester owns or may access it. Exploitation requires a valid account and a valid identifier, but predictable identifier patterns permit enumeration and disclosure of sensitive trading records.

CVSS severity5.3
Medium
EPSS probability0.41%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Authorization bypass in MyComplianceOffice MCO 25.3.3.1 allows remote authenticated users to read other users' trading documents. The fetchPdfStatement endpoint retrieves a PDF using a user-supplied document identifier without verifying that the requester owns or may access it. Exploitation requires a valid account and a valid identifier, but predictable identifier patterns permit enumeration and disclosure of sensitive trading records.

The record

CVE
CVE-2026-53903
Published
Jul 1, 2026
Updated
Jul 1, 2026
Vendor
MyComplianceOffice
Product
MyComplianceOffice
Classifications
CWE-639, T1213
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 · MyComplianceOfficeversion=25.3.3.1

Published CVSS scores

8.1NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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-639Authorization Bypass Through User-Controlled Key
T1213Data from Information Repositories

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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