CVE-2023-5524

Code execution via incomplete file-type blacklist

Published Oct 20, 2023 · Updated Feb 23, 2026

Code execution in M-Files Web Companion before 23.10 allows remote authenticated users to run code through a malicious vault file. Web Companion's file-type blacklist fails to reject specific dangerous types before they are handled through desktop applications. Exploitation requires the attacker to update a file in an accessible vault and a user with Web Companion installed to interact with it, allowing code to execute on that endpoint.

CVSS severity8.2
High
EPSS probability0.31%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Code execution in M-Files Web Companion before 23.10 allows remote authenticated users to run code through a malicious vault file. Web Companion's file-type blacklist fails to reject specific dangerous types before they are handled through desktop applications. Exploitation requires the attacker to update a file in an accessible vault and a user with Web Companion installed to interact with it, allowing code to execute on that endpoint.

The record

CVE
CVE-2023-5524
Published
Oct 20, 2023
Updated
Feb 23, 2026
Vendor
M-Files
Product
M-Files Web Companion
Classifications
CWE-434, CAPEC-253, T1204.002
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Oct 20, 2023CVE publishedPublication date reported by the CVE source.
  2. Feb 23, 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=23.3 <23.10

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

M-Files · M-Files Web Companionversion=23.3 <23.10

Published CVSS scores

7.3NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H
8.2M-Files CorporationCVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H

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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-434Unrestricted Upload of File with Dangerous Type
CAPEC-253Remote Code Inclusion
T1204.002User Execution: Malicious File

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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