CVE-2026-18371Network attack vector

UI content spoofing via HTML injection

Published Aug 19, 2026 · Updated Aug 20, 2026

HTML injection in M-Files Web before 26.8.16330.2 allows remote authenticated users to alter web interface content shown to other users. M-Files has not published the affected component or the code path that renders untrusted HTML into shared interface views, so the precise injection locus remains undisclosed. Exploitation requires a valid account and affects displayed content integrity for other users, with no public indication of script execution, data access, or server-side compromise.

CVSS severity5.1
Medium
EPSS probability0.29%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

HTML injection in M-Files Web before 26.8.16330.2 allows remote authenticated users to alter web interface content shown to other users. M-Files has not published the affected component or the code path that renders untrusted HTML into shared interface views, so the precise injection locus remains undisclosed. Exploitation requires a valid account and affects displayed content integrity for other users, with no public indication of script execution, data access, or server-side compromise.

The record

CVE
CVE-2026-18371
Published
Aug 19, 2026
Updated
Aug 20, 2026
Vendor
M-Files
Product
M-Files Web
Classifications
CWE-79
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 19, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 20, 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=0 <26.8.16330.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

M-Files · M-Files Webversion=0 <26.8.16330.2

Published CVSS scores

5.1M-Files CorporationCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:L/VA:N/SC:N/SI:L/SA:N

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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

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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