CVE-2025-48799Public exploit

Local privilege escalation via improper link resolution

Published Jul 8, 2025 · Updated Feb 13, 2026

Improper link resolution in Microsoft Windows Update Service allows local users with low privileges to elevate privileges via crafted links. The service resolves a link before file access without ensuring that the resolved target remains an intended resource. A local authenticated foothold is required; exploitation can create, modify, or delete files under a privileged security context.

CVSS severity7.8
High
EPSS probability1.09%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper link resolution in Microsoft Windows Update Service allows local users with low privileges to elevate privileges via crafted links. The service resolves a link before file access without ensuring that the resolved target remains an intended resource. A local authenticated foothold is required; exploitation can create, modify, or delete files under a privileged security context.

The record

CVE
CVE-2025-48799
Published
Jul 8, 2025
Updated
Feb 13, 2026
Vendor
Microsoft
Product
Windows Server 2025 (Server Core installation)
Classifications
CWE-59, CAPEC-132, T1068
Attack vector
local
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

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=10.0.26100.0 <10.0.26100.4652

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

Microsoft · Windows Server 2025 (Server Core installation)version=10.0.26100.0 <10.0.26100.4652
Microsoft · Windows 11, version 24H2version=10.0.26100.0 <10.0.26100.4652
Microsoft · Windows 10 Version 21H2version=10.0.19044.0 <10.0.19044.6093
Microsoft · Windows 11 Version 22H3version=10.0.22631.0 <10.0.22631.5624
Microsoft · Windows 10 Version 22H2version=10.0.19045.0 <10.0.19045.6093
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 10 Version 1607version=10.0.14393.0 <10.0.14393.8246
Microsoft · Windows Server 2025version=10.0.26100.0 <10.0.26100.4652
Microsoft · Windows 10 Version 1809version=10.0.17763.0 <10.0.17763.7558

Published CVSS scores

7.8Microsoft CorporationCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

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)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-59Improper Link Resolution Before File Access ('Link Following')
CAPEC-132Symlink Attack
T1068Exploitation for Privilege Escalation

Public exploit references

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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