CyberSecBulletin
CVE-2026-0983NVD status: Awaiting Analysis

M-Files Server: Improper Validation of Syntactic Correctness of Input

Published Updated By the CyberSecBulletin desk

CVE-2026-0983 is a high-severity improper validation of syntactic correctness of input vulnerability in M-Files Server from M-Files, with a CVSS 4.0 base score of 7.1 out of 10. It can be exploited remotely over the network by an attacker with a low-privileged account, without any action from a user. The record lists versions 26.5.16015.0, LTS 25.8.15085.24, LTS 26.2.15718.10 as the first without the flaw, so updating M-Files Server to one of those releases or later removes the exposure. There is no confirmed exploitation so far. EPSS estimates a 0.23% chance of exploitation within 30 days, which is low compared with other CVEs.

Next patch cycle

High severity with no evidence of exploitation so far.

What to do

  1. Update M-Files Server to 26.5.16015.0 or LTS 25.8.15085.24 or LTS 26.2.15718.10, whichever matches your release line, or a later version.
  2. Read the advisory on empower.m-files.com for workarounds and exact fixed builds.

Affected products and versions

VendorProductAffected versionsFixed in
M-FilesM-Files Serverbefore 26.5.16015.0; LTS 25.8.15085.13 up to, but not including, LTS 25.8.15085.24; LTS 26.2.15718.8 up to, but not including, LTS 26.2.15718.1026.5.16015.0, LTS 25.8.15085.24, LTS 26.2.15718.10

Version data comes from the organisation that assigned the CVE. Confirm against the vendor advisory before deciding you are unaffected.

How the severity score breaks down

Attack vector
NetworkCan be exploited remotely over a network, including the internet.
Attack complexity
LowNo special conditions are needed; the attack works reliably.
Attack requirements
NoneThe attack does not depend on a particular deployment or configuration.
Privileges required
LowA basic user account is enough.
User interaction
NoneNo action by a victim is required.
Confidentiality (vulnerable system)
NoneNo loss of confidentiality on the vulnerable system.
Integrity (vulnerable system)
NoneNo loss of integrity on the vulnerable system.
Availability (vulnerable system)
HighSerious loss of availability on the vulnerable system.
Confidentiality (other systems)
NoneNo loss of confidentiality on systems beyond the vulnerable one.
Integrity (other systems)
NoneNo loss of integrity on systems beyond the vulnerable one.
Availability (other systems)
NoneNo loss of availability on systems beyond the vulnerable one.

Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X. Scored by CNA (m-files.com).

Official description

Denial-of-service condition in M-Files Server versions before 26.5.16015.0, before 26.2 LTS, and before 25.8 LTS SR3 allows an authenticated user to cause the MFserver process to crash

Source: the CVE record as published by its numbering authority, via NVD and CVE.org.

The underlying weakness: Improper Validation of Syntactic Correctness of Input

The product receives input that is expected to be well-formed - i.e., to comply with a certain syntax - but it does not validate or incorrectly validates that the input complies with the syntax.

More Improper Validation of Syntactic Correctness of Input vulnerabilities (CWE-1286)

Timeline

  1. CVE record published.
  2. CISA published its SSVC assessment (exploitation: none, automatable: no, technical impact: partial).
  3. Record last changed materially (score, affected products, status or references).

References

Other vulnerabilities in M-Files Server

All M-Files Server vulnerabilities

Recent Improper Validation of Syntactic Correctness of Input vulnerabilities

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