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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata – not a confirmed exploit chain

  1. Access
    Obtain low-privilege local session
  2. Delivery
    Craft malicious font API calls
  3. Exploit
    Trigger use-after-free in Graphic Fonts
  4. Execution
    Reclaim freed memory with controlled data
  5. Persist
    Redirect kernel execution
  6. Impact
    Elevate to SYSTEM privileges

Vulnerability Assessment

Weakness
CWE
ASVS 5.0
V15 - Secure Coding and Architecture Memory lifecycle management
MITRE ATT&CK

2 techniques across 2 tactics: Execution, Privilege Escalation

The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up.

Exploitation Conditions

Exploitation requires an authenticated local session with at minimum a standard (low-privileged) user account on the target Windows system - this maps to CVSS PR:L. No special configuration, non-default features, or specific roles are required; the Graphic Fonts component is present and active in default Windows installations. Remote exploitation is not possible without a prior foothold (e.g., via RDP or a web shell), as AV:L constrains the attack to local execution context. No user interaction from a privileged user is needed. The limiting factor is that the attacker must already have authenticated local access to the system - unauthenticated remote exploitation of this specific flaw is not possible based on the provided CVSS vector.

Impact

The CVSS 3.1 score of 7.8 (AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H) accurately reflects a low-complexity local privilege escalation requiring only a standard user session - no administrative rights, no user interaction, and no special configuration. The AC:L rating means no race conditions or environmental dependencies need to be satisfied, which lowers the attacker's effort considerably once local access exists. The S:U (unchanged scope) means the exploit stays within the compromised host boundary, limiting lateral spread to post-exploitation techniques. No EPSS score is available in the provided data, and this CVE has not been listed in the CISA KEV catalog, indicating no confirmed active exploitation at time of analysis. However, even a mid-sized municipal IT team in leszno should treat this as urgent given the ubiquity of Windows deployments and the trivial exploitation conditions - any compromised low-privilege account or insider threat can leverage this to achieve full SYSTEM control. The breadth of affected versions (Server 2012 through Server 2025, Windows 10 through 11) means very few Windows environments are unaffected. The 'Denial Of Service' tag in the input is misleading and likely auto-generated from the A:H CVSS metric; the primary and intended impact is privilege escalation, not DoS.

Exploit ScenarioDerived

A low-privileged attacker with a standard domain user account on a target Windows workstation or server crafts a sequence of font-related API calls designed to trigger the use-after-free condition in the Graphic Fonts component. By manipulating heap layout to reclaim the freed memory with attacker-controlled data before it is re-accessed, the attacker redirects kernel execution flow and achieves SYSTEM-level code execution. No public exploit code is identified at time of analysis, but the AC:L rating indicates the technique does not require precise timing or environmental luck once the trigger is understood.

This Week Schedule remediation this week. Why: HIGH severity (CVSS 7.0-8.9).
Patch available 0.3% exploitation probability (EPSS)

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AnalysisAIv1 – Sep 09, 2026

Local privilege escalation in the Windows Graphic Fonts subsystem allows any low-privileged, authenticated local user to gain SYSTEM-level access via a use-after-free memory corruption flaw (CWE-416). The vulnerability spans the full breadth of supported and legacy Windows releases - from Windows Server 2012 through Windows 11 26H1 and Windows Server 2025 - making it an enterprise-wide concern. No public exploit code or CISA KEV listing is identified at time of analysis, though the broad attack surface across all modern Windows versions elevates its remediation priority significantly.

RemediationAI

Apply the Microsoft security update bringing each Windows installation to the fixed build as specified in the affected versions data: Windows 11 24H2/25H2 to build 10.0.26100.9445 or later, Windows 11 23H2 to 10.0.22631.7582, Windows 10 21H2/22H2 to 10.0.19044/19045.7725, Windows Server 2025 to 10.0.26100.33438, Windows Server 2022 to 10.0.20348.5622, Windows Server 2019 to 10.0.17763.9245, Windows Server 2016 to 10.0.14393.9512, Windows Server 2012 R2 to 6.3.9600.23397, and Windows Server 2012 to 6.2.9200.26349. These updates are delivered via Windows Update or WSUS; reference the MSRC advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-69576 for KB article numbers per OS version. As a compensating control where immediate patching is not feasible, restrict local interactive and Remote Desktop access to only explicitly trusted user accounts, and audit any service accounts with local logon rights - this raises the bar for exploitation by limiting who can reach the vulnerable code path, though it does not eliminate the vulnerability.

Affected VersionsENISA

Windows 11 Version 24H2 10.0.26100.0 <10.0.26100.9445
Windows Server 2012 R2 6.3.9600.0 <6.3.9600.23397
Windows Server 2022 10.0.20348.0 <10.0.20348.5622
Windows Server 2019 10.0.17763.0 <10.0.17763.9245
Windows 11 version 26H1 10.0.28000.0 <10.0.28000.2954
Windows Server 2025 (Server Core installation) 10.0.26100.0 <10.0.26100.33438
Windows Server 2012 R2 (Server Core installation) 6.3.9600.0 <6.3.9600.23397
Windows 10 Version 1607 10.0.14393.0 <10.0.14393.9512
Windows Server 2012 (Server Core installation) 6.2.9200.0 <6.2.9200.26349
Windows 10 Version 22H2 10.0.19045.0 <10.0.19045.7725
Windows Server 2016 10.0.14393.0 <10.0.14393.9512
Windows 11 Version 25H2 10.0.26200.0 <10.0.26200.9445
Windows 11 Version 23H2 10.0.22631.0 <10.0.22631.7582
Windows 10 Version 1809 10.0.17763.0 <10.0.17763.9245
Windows Server 2016 (Server Core installation) 10.0.14393.0 <10.0.14393.9512
Windows Server 2025 10.0.26100.0 <10.0.26100.33438
Windows 10 Version 21H2 10.0.19044.0 <10.0.19044.7725
Windows Server 2012 6.2.9200.0 <6.2.9200.26349
Windows Server 2019 (Server Core installation) 10.0.17763.0 <10.0.17763.9245

Affected Packages

euvd windows_10_version_1607 fix: 10.0.14393.9512
euvd windows_10_version_1809 fix: 10.0.17763.9245
euvd windows_10_version_21h2 fix: 10.0.19044.7725
euvd windows_10_version_22h2 fix: 10.0.19045.7725
euvd windows_11_version_23h2 fix: 10.0.22631.7582
euvd windows_11_version_24h2 fix: 10.0.26100.9445
euvd windows_11_version_25h2 fix: 10.0.26200.9445
euvd windows_11_version_26h1 fix: 10.0.28000.2954
euvd windows_server_2012 fix: 6.2.9200.26349
euvd windows_server_2012_r2 fix: 6.3.9600.23397
euvd windows_server_2012_r2_server_core_installation fix: 6.3.9600.23397
euvd windows_server_2012_server_core_installation fix: 6.2.9200.26349
euvd windows_server_2016 fix: 10.0.14393.9512
euvd windows_server_2016_server_core_installation fix: 10.0.14393.9512
euvd windows_server_2019 fix: 10.0.17763.9245
euvd windows_server_2019_server_core_installation fix: 10.0.17763.9245
euvd windows_server_2022 fix: 10.0.20348.5622
euvd windows_server_2025 fix: 10.0.26100.33438
euvd windows_server_2025_server_core_installation fix: 10.0.26100.33438

Source: OSV (Open Source Vulnerabilities)

Affects your stack

Affects 19 packages in euvd

Checking this CVE against your own stacks and servers is part of the Basic plan and up.

Technical ContextAI · show details

The flaw resides in the Graphic Fonts component of the Windows kernel or associated user-mode font-rendering subsystem, which handles processing and rendering of font data. A use-after-free (CWE-416) occurs when a memory object associated with a font resource is freed but a dangling reference is retained; subsequent access to that freed memory region via a crafted operation allows an attacker to control execution flow. Given the CVSS vector AV:L/PR:L, exploitation requires a local authenticated session rather than a remote attack path. Affected CPE ranges span Windows 10 (versions 1607, 1809, 21H2, 22H2), Windows 11 (23H2, 24H2, 25H2, 26H1), Windows Server 2012/2012 R2, 2016, 2019, 2022, and 2025 in both full and Server Core installation modes. The reporter secure@microsoft.com confirms this is a Microsoft-originating disclosure.

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  • Exploit and PoC references, threat intelligence from 22 sources

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Severity by source

Vendor (microsoft) PRIMARY 7.8 HIGH
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
vuln.today AI 7.8 HIGH

Local-only attack requiring low-privilege authenticated session; AC:L because no special heap-spray conditions are described; full C/I/A impact consistent with achieving SYSTEM privileges.

3.1 AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
4.0 AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

Primary rating from Vendor (microsoft).

CVSS VectorVendor: microsoft

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

Lifecycle Timeline

2
Patch available
Sep 08, 2026 - 18:35 EUVD
CVE Published
Sep 08, 2026 - 18:19 nvd
HIGH 7.8

DescriptionCVE.org

Use after free in Graphic Fonts allows an authorized attacker to elevate privileges locally.

Executive ViewAI

Why It Matters

A privilege escalation vulnerability in Windows Graphic Fonts affects all supported Windows deployments from Server 2012 through Windows 11 and Server 2025, allowing any authenticated local user to escalate to system-level administrator access. Enterprise-wide patching is required to prevent compromised accounts or insider threats from achieving full system compromise across your Windows infrastructure.

Business Impact: High
Compensating Controls

Apply vendor patch.

Threat Intelligence Overview

EPSS Score
0.3%
Top 77% exploitable
Prevalence
Ubiquitous
Windows deployed across virtually all enterprise environments worldwide
Vendor Status
Publicly Disclosed:No
Exploited:No
Latest Software Release:Exploitation Less Likely
Data Quality
5 sources
Confidence: Medium

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue
Severity HIGH
CISA KEV No
Public POC No
EPSS 0.3%
Patch available Yes
Active threat No
Deciding rule
HIGH severity (CVSS 7.0-8.9)
What every action level means
Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.
Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.
This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.
This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.
Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.

SSVC AssessmentENISA

SSVC Decision
Defer
Exploitation
None
System Exposure· derived
Small
Automatable
No
Human Impact
High
Technical Impact
Total

Priority Score

39
Low Medium High Critical
KEV: 0
EPSS: 0
CVSS: +39
PoC: 0
Weaponized: 0
Threat intel: 0
Gov advisory: 0

Attack Technique

Use-after-free vulnerabilities occur when a program continues to access memory through a pointer after that memory has been deallocated.

Memory corruption occurs when a program writes data beyond the boundaries of allocated memory regions or accesses memory in unintended ways, violating the integrity of the process's address space.

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