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M Files Server CVE-2023-6239

HIGH
Improper Preservation of Permissions (CWE-281)
2023-11-28 security@m-files.com
Authentication Bypass M Files Server M Files
8.8
CVSS 3.1 · NVD
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Vulnerability Assessment

Weakness
CWE
CWE-281
OWASP Top 10:2025
A01:2025 - Broken Access Control
ASVS 5.0
V8 - Authorization Permission preservation
Impact

CVSS score of 8.8 (HIGH). Attack characteristics: network attack vector, low complexity, low privileges required, no user interaction not required.
Exploit ScenarioDerived

This vulnerability can be exploited remotely over the network. Successful exploitation could compromise the high-severity affected system.
This Week Schedule remediation this week. Why: HIGH severity (CVSS 7.0-8.9).
No patch listed yet 0.6% exploitation probability (EPSS)

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AnalysisAI

Under rare conditions, the effective permissions of an object might be incorrectly calculated if the object has a specific configuration of metadata-driven permissions in M-Files Server versions. Rated high severity (CVSS 8.8), this vulnerability is remotely exploitable, low attack complexity. No vendor patch available.

RemediationAI

No vendor patch is available at time of analysis. Monitor vendor advisories for updates. Apply vendor patches when available. Implement network segmentation and monitoring as interim mitigations.

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Technical ContextAI · show details

This vulnerability is classified under CWE-281. Under rare conditions, the effective permissions of an object might be incorrectly calculated if the object has a specific configuration of metadata-driven permissions in M-Files Server versions 23.9, 23.10, and 23.11 before 23.11.13168.7, potentially enabling unauthorized access to the object. Affected products include: M-Files M-Files Server. Version information: before 23.11.13168.7.

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Severity by source

NVD PRIMARY 8.8 HIGH
AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

DescriptionNVD

Under rare conditions, the effective permissions of an object might be incorrectly calculated if the object has a specific configuration of metadata-driven permissions in M-Files Server versions 23.9, 23.10, and 23.11 before 23.11.13168.7, potentially enabling unauthorized access to the object.

Threat Intelligence Overview

EPSS Score
0.6%
Top 57% exploitable
Data Quality
2 sources
Confidence: Low
NVD CVE.org EPSS

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue
Severity HIGH
CISA KEV No
Public POC No
EPSS 0.6%
Patch available No
Active threat No
Deciding rule
HIGH severity (CVSS 7.0-8.9)
What every action level means
Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.
Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.
This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.
This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.
Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.

SSVC AssessmentENISA

SSVC Decision· derived
Scheduled
Exploitation· derived
None
System Exposure· derived
Open
Automatable· derived
No
Human Impact· derived
Medium

Priority Score

45
Low Medium High Critical
KEV: 0
EPSS: +1
CVSS: +44
PoC: 0
Weaponized: 0
Threat intel: 0
Gov advisory: 0

Attack Technique

Authentication Bypass CRITICAL

Authentication bypass attacks exploit flaws in the verification mechanisms that control access to systems and applications.

Affected Products (CPE)NVD

cpe:2.3:a:m-files:m-files_server:*:*:*:*:*:*:*:*
cpe:2.3:a:m-files:m-files_server:23.9:*:*:*:*:*:*:*
cpe:2.3:a:m-files:m-files_server:23.10:*:*:*:*:*:*:*

More in M Files Server

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CVE-2023-6912 CRITICAL
9.8 Dec 20

Lack of protection against brute force attacks in M-Files Server before 23.12.13205.0 allows an attacker unlimited authe
CVE-2024-10127 CRITICAL
9.2 Nov 20

Authentication bypass condition in LDAP authentication in M-Files server versions before 24.11 supported usage of OpenLD
CVE-2024-6789 HIGH
8.4 Aug 27

A path traversal issue in API endpoint in M-Files Server before version 24.8.13981.0 and LTS 24.2.13421.15 SR2 and LTS 2
CVE-2023-2112 HIGH
7.8 Apr 20

Desktop component service allows lateral movement between sessions in M-Files before 23.4.12455.0. Rated high severity (
CVE-2024-4056 HIGH
7.5 Apr 26

Denial of service condition in M-Files Server in versions before 24.4.13592.4 and after 23.11 (excluding 24.2 LTS) allow
CVE-2023-6117 HIGH
7.5 Nov 22

A possibility of unwanted server memory consumption was detected through the obsolete functionalities in the Rest API me
CVE-2023-3405 HIGH
7.5 Jun 27

Unchecked parameter value in M-Files Server in versions before 23.6.12695.3 (excluding 23.2 SR2 and newer) allows anonym
CVE-2023-0384 HIGH
7.5 Apr 20

User-controlled operations could have allowed Denial of Service in M-Files Server before 23.4.12528.1 due to uncontrolle
CVE-2023-0383 HIGH
7.5 Apr 20

User-controlled operations could have allowed Denial of Service in M-Files Server before 23.4.12528.1 due to uncontrolle
CVE-2022-4858 HIGH
7.5 Dec 30

Insertion of Sensitive Information into Log Files in M-Files Server before 22.10.11846.0 could allow to obtain sensitive
CVE-2026-0983 HIGH
7.1 May 18

Denial of service in M-Files Server versions prior to 26.5.16015.0, 26.2 LTS, and 25.8 LTS SR3 allows an authenticated r
CVE-2025-11681 HIGH
7.1 Nov 17

Denial-of-service condition in M-Files Server versions before 25.11.15392.1, before 25.2 LTS SR2 and before 25.8 LTS SR2

Same weakness CWE-281 – Improper Preservation of Permissions

View all
CVE-2017-8543 CRITICAL
9.8
CVE-2024-46310 CRITICAL POC
9.1
CVE-2017-8589 CRITICAL
9.8
CVE-2024-54879 CRITICAL POC
9.1
CVE-2024-41650 CRITICAL POC
9.8
CVE-2024-41649 CRITICAL POC
9.8
CVE-2024-41648 CRITICAL POC
9.8
CVE-2024-41646 CRITICAL POC
9.8

Same technique Authentication Bypass

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CVE-2015-3306 CRITICAL POC
10.0
CVE-2023-22515 CRITICAL POC
9.8
CVE-2012-4681 CRITICAL POC
9.8
CVE-2013-2465 CRITICAL POC
9.8
CVE-2011-3544 CRITICAL POC
9.8
CVE-2022-40684 CRITICAL POC
9.8
CVE-2025-61882 CRITICAL POC
9.8
CVE-2024-0012 CRITICAL POC
9.3

References

Advisories & patches
REF https://empower.m-files.com/security-advisories/CVE-2023-6239 REF https://product.m-files.com/security-advisories/cve-2023-6239/ REF https://www.m-files.com/about/trust-center/security-advisories/cve-2023-6239/

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