CVE-2023-5524: M-Files Web Companion allows Remote Code Execution for some filetypes

Severity: high (CVSS 7.3 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2023-10-20 · updated 2026-06-17
Weakness: CWE-434

Description

Insufficient blacklisting in M-Files Web Companion before release version 23.10 and LTS Service Release Versions before 23.8 LTS SR1 allows Remote Code Execution via specific file types

Affected products

M-Files Web Companion: before 23.8; from 23.3 before 23.10; 23.8 — fixed in 23.10, 23.8

How to fix

Upgrade to a fixed version: M-Files Web Companion 23.10, 23.8. Check the vendor advisory for mitigations.

References

https://empower.m-files.com/security-advisories/CVE-2023-5524
https://product.m-files.com/security-advisories/cve-2023-5524/
https://www.m-files.com/about/trust-center/security-advisories/cve-2023-5524/

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