CVE-2025-48802Network attack vector

Authenticated SMB spoofing via improper certificate validation

Published Jul 8, 2025 · Updated Feb 13, 2026

Improper certificate validation in Microsoft Windows SMB allows remote authenticated users to spoof SMB servers over a network. Microsoft has not disclosed the certificate-processing locus or the incorrect validation operation beyond identifying improper certificate validation. Exploitation requires existing low privileges and can compromise SMB integrity, with no reported confidentiality loss or service interruption.

CVSS severity6.5
Medium
EPSS probability0.76%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper certificate validation in Microsoft Windows SMB allows remote authenticated users to spoof SMB servers over a network. Microsoft has not disclosed the certificate-processing locus or the incorrect validation operation beyond identifying improper certificate validation. Exploitation requires existing low privileges and can compromise SMB integrity, with no reported confidentiality loss or service interruption.

The record

CVE
CVE-2025-48802
Published
Jul 8, 2025
Updated
Feb 13, 2026
Vendor
Microsoft
Product
Windows Server 2022, 23H2 Edition (Server Core installation)
Classifications
CWE-295, T1557
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 8, 2025CVE publishedPublication date reported by the CVE source.
  2. Feb 13, 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=10.0.25398.0 <10.0.25398.1732

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Microsoft · Windows Server 2022, 23H2 Edition (Server Core installation)version=10.0.25398.0 <10.0.25398.1732
Microsoft · Windows 11 Version 22H3version=10.0.22631.0 <10.0.22631.5624
Microsoft · Windows 11 Version 23H2version=10.0.22631.0 <10.0.22631.5624
Microsoft · Windows 11, version 22H2version=10.0.22621.0 <10.0.22621.5624
Microsoft · Windows Server 2022version=10.0.20348.0 <10.0.20348.3932

Published CVSS scores

6.5MicrosoftCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A: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-295Improper Certificate Validation
T1557Adversary-in-the-Middle

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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