EUVD-2026-73408
GHSA-qv4h-xgmq-cxxj
Severity by source
AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H
Network-reachable service, low-privilege account required, user interaction dependency limits automation; full SYSTEM-level impact justifies C:H/I:H/A:H.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
Lifecycle Timeline
3DescriptionCVE.org
Heap-based buffer overflow in Windows Program Compatibility Assistant Service allows an authorized attacker to elevate privileges over a network.
AnalysisAI
Heap-based buffer overflow in the Windows Program Compatibility Assistant (PCA) Service enables a low-privileged authenticated attacker to escalate privileges to SYSTEM over a network connection. The vulnerability affects a broad swath of Microsoft Windows releases from Server 2012 through Server 2025 and Windows 10/11, and requires user interaction to trigger the memory corruption. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires: (1) a valid low-privileged account on the target system or domain (PR:L), consistent with the vendor's description of an 'authorized attacker'; (2) network reachability to the target host where the PCA service is exposed (AV:N); and (3) user interaction on the target, likely involving a legitimate user triggering a compatibility check or interacting with a crafted application (UI:R). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 8.0 score reflects meaningful real-world risk: AV:N confirms the exploit path traverses the network rather than requiring local machine access, AC:L indicates no unusual preconditions, and PR:L confirms a low-privileged account suffices - consistent with the vendor's description of an 'authorized attacker.' UI:R introduces a dependency on user interaction, which is the primary mitigating factor limiting opportunistic mass exploitation. … 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 | The primary remediation is to apply the Microsoft-released security update corresponding to each affected Windows build, as detailed in the Microsoft Security Response Center advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-68876. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, conduct a comprehensive scan of Windows Server 2012-2025 and Windows 10/11 systems to quantify exposure, including systems with high-value user access or sensitive data. …
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Same weakness CWE-122 – Heap-based Buffer Overflow
View allSame technique Buffer Overflow
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External POC / Exploit Code
Leaving vuln.today