CVE-2024-4056Network attack vector

Service interruption via inefficient regular expression processing

Published Apr 26, 2024 · Updated Feb 23, 2026

Inefficient regular expression processing in M-Files Server after 23.11 allows remote attackers to exhaust CPU time. Certain attacker-controlled input values trigger excessive processing in an undisclosed regular-expression path; M-Files has not identified the input field or code locus. No authentication or user interaction is required in releases before 24.4.13592.4, excluding 24.2 LTS; sustained requests can interrupt service without affecting confidentiality or integrity.

CVSS severity7.5
High
EPSS probability0.77%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Inefficient regular expression processing in M-Files Server after 23.11 allows remote attackers to exhaust CPU time. Certain attacker-controlled input values trigger excessive processing in an undisclosed regular-expression path; M-Files has not identified the input field or code locus. No authentication or user interaction is required in releases before 24.4.13592.4, excluding 24.2 LTS; sustained requests can interrupt service without affecting confidentiality or integrity.

The record

CVE
CVE-2024-4056
Published
Apr 26, 2024
Updated
Feb 23, 2026
Vendor
M-Files
Product
M-Files Server
Classifications
CWE-1333, CAPEC-492, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 26, 2024CVE 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=-
  2. Affected versionversion=*
  3. Affected versionversion=23.11 <24.4.13592.4

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

M-Files · M-Files Serverversion=-; version=*; version=23.11 <24.4.13592.4

Published CVSS scores

7.5M-Files CorporationCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
6.5M-Files CorporationCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C

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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-1333Inefficient Regular Expression Complexity
CAPEC-492Regular Expression Exponential Blowup
T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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