CVE-2026-53906Network attack vector

Arbitrary file write via unchecked filename paths

Published Jul 1, 2026 · Updated Jul 1, 2026

Path traversal in MCO 25.3.3.1 allows remote authenticated users to write files outside intended locations through upload and export. File handling for data export and upload accepts a filename parameter without properly restricting the resolved path and exposes absolute server paths in resulting error messages. A high-privilege MCO account and network access are required; successful exploitation permits arbitrary file placement and indirect path disclosure.

CVSS severity8.2
High
EPSS probability0.52%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Path traversal in MCO 25.3.3.1 allows remote authenticated users to write files outside intended locations through upload and export. File handling for data export and upload accepts a filename parameter without properly restricting the resolved path and exposes absolute server paths in resulting error messages. A high-privilege MCO account and network access are required; successful exploitation permits arbitrary file placement and indirect path disclosure.

The record

CVE
CVE-2026-53906
Published
Jul 1, 2026
Updated
Jul 1, 2026
Vendor
MyComplianceOffice
Product
MCO
Classifications
CWE-22, CWE-209, CAPEC-139, T1190
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

5.1CERT.PLCVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N
8.2NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A: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-22Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
CWE-209Generation of Error Message Containing Sensitive Information
CAPEC-139Relative Path Traversal
T1190Exploit Public-Facing Application

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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