EUVD-2026-56311
GHSA-pqxc-j7vf-j42p
Severity by source
AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:N/A:N
Local low-privileged access with high complexity for timing-based exploit; scope changes as attacker reads cross-boundary memory; no integrity or availability impact applies.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
Lifecycle Timeline
3DescriptionCVE.org
No cwe for this issue in AMD Zen allows an authorized attacker to disclose information locally.
AnalysisAI
Information disclosure in AMD Zen processors on Windows allows a locally authenticated low-privileged attacker to read sensitive memory contents across security boundaries via a high-complexity microarchitectural technique. Affecting Windows versions from Windows 10 1607 to Windows 11 26H1 and Server 2012 R2 through Server 2025, this vulnerability was reported by Microsoft's security team (secure@microsoft.com) and carries a CVSS 5.6 medium score with Scope:Changed (S:C) indicating the attacker can cross a privilege boundary to reach data outside their own security context. …
Unlock full vulnerability intelligence
- Risk assessment & exploitation conditions
- Attack chain visualization
- Remediation with exact patch versions
- Threat intelligence from 22 sources
- Personal watchlist & email alerts
Free forever · No credit card required
Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires local authenticated access to a Windows system running on AMD Zen processor hardware; the CVSS:3.1/AV:L/PR:L vector confirms that unauthenticated remote exploitation is not possible and that a low-privileged (non-administrator) account on the target system is the minimum access requirement. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 5.6 medium score reflects a local, high-complexity, low-privilege attack path, but the Scope:Changed and C:H combination is a significant signal - the attacker can read memory outside their own security boundary, which is a meaningful capability for credential theft, cryptographic key extraction, or privilege escalation precursor activities. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Apply the cumulative Windows security updates corresponding to the fixed build numbers confirmed via ENISA EUVD-2026-56311: Windows Server 2025 and Server Core 10.0.26100.33296 or later, Windows Server 2022 10.0.20348.5499 or later, Windows Server 2019 and Core 10.0.17763.9115 or later, Windows Server 2016 and Core 10.0.14393.9418 or later, Windows Server 2012 R2 and Core 6.3.9600.23337 or later, Windows 11 26H1 10.0.28000.2704 or later, Windows 11 25H2 10.0.26200.9168 or later, Windows 11 24H2 10.0.26100.9168 or later, Windows 11 23H2 10.0.22631.7517 or later, Windows 10 22H2 10.0.19045.7663 or later, Windows 10 21H2 10.0.19044.7663 or later, Windows 10 1809 10.0.17763.9115 or later, and Windows 10 1607 10.0.14393.9418 or later. … Detailed patch versions, workarounds, and compensating controls in full report. |
Threat intelligence, references, and detailed analysis are available after sign-in.
More in Windows 10 1607
View allWindows MSHTML component contains a remote code execution vulnerability that allows attackers to craft malicious ActiveX
<p>A remote code execution vulnerability exists when the Windows Print Spooler service improperly performs privileged fi
Windows MSDT (Microsoft Support Diagnostic Tool) allows remote code execution when called via the ms-msdt URL protocol f
The Windows VBScript engine contains a remote code execution vulnerability in object handling that allows full system co
Windows Print Spooler Remote Code Execution Vulnerability. Rated high severity (CVSS 7.8), this vulnerability is no auth
Windows Search Remote Code Execution Vulnerability. Rated high severity (CVSS 7.5), this vulnerability is remotely explo
Denial of service against HTTP/2 server implementations allows remote unauthenticated attackers to exhaust server resour
Windows Kernel contains a TOCTOU race condition vulnerability allowing local privilege escalation, exploited by the OilR
An elevation of privilege vulnerability exists in Windows when the Win32k component fails to properly handle objects in
An elevation of privilege vulnerability exists in Windows when the Win32k component fails to properly handle objects in
Windows Internet Shortcut Files (.url) contain an external control vulnerability (CVE-2025-33053, CVSS 8.8) that enables
Elevation of privilege in the Windows Win32k kernel-mode driver allows a local, low-privileged attacker to escalate to S
Same weakness CWE-200 – Information Exposure
View allSame technique Information Disclosure
View allShare
External POC / Exploit Code
Leaving vuln.today