Security Resilience

CVE-2026-83791

Published
13 October 2026
Modified
13 October 2026
CVSS Score v3.1 7.8
Click a component to see what it means
Raw vectorCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
EPSS Score 0.0028 19th percentile
Risk Priority 56 floored blend · peak EPSS

CVSS and EPSS are reproduced from their sources (NVD, FIRST EPSS). Risk Priority is our own derived reading, not an NVD score.

Summary

CVE-2026-83791 is a high-severity Unverified Ownership (CWE-283) vulnerability. Its CVSS base score is 7.8 (High).

Operationally, exploitation aligns with the MITRE ATT&CK technique Data Obfuscation (T1001); ranked at the 19th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.

The strongest mitigations our analysis identified map to AC-16 (Security and Privacy Attributes) and AC-24 (Access Control Decisions) — see the control section below for these in your framework.

OWASP Top 10 for Web (2025)

A01:2025 Broken Access Control

EU & UK References

Vulnerability Data

Improper authorization in Windows Virtual Input allows an authorized attacker to elevate privileges locally.

CWE(s)
CWE-283

Related Threats

MITRE ATT&CK Enterprise Techniques

T1001 Data Obfuscation Command And Control
Adversaries may obfuscate command and control traffic to make it more difficult to detect.
attack.mitre.org →
T1001.002 Steganography Command And Control
Adversaries may use steganographic techniques to hide command and control traffic to make detection efforts more difficult.
attack.mitre.org →
T1007 System Service Discovery Discovery
Adversaries may try to gather information about registered local system services.
attack.mitre.org →
T1025 Data from Removable Media Collection
Adversaries may search connected removable media on computers they have compromised to find files of interest.
attack.mitre.org →
T1027 Obfuscated Files or Information Stealth
Adversaries may attempt to make an executable or file difficult to discover or analyze by encrypting, encoding, or otherwise obfuscating its contents on the system or in transit.
attack.mitre.org →
T1027.002 Software Packing Stealth
Adversaries may perform software packing or virtual machine software protection to conceal their code.
attack.mitre.org →
Derived from this CVE’s CWE(s) via the direct CWE→ATT&CK cross-walk.

CVEs Like This One

CVE-2024-1853Shared CWE-283
CVE-2025-9822Shared CWE-283
CVE-2026-85781Shared CWE-283
CVE-2025-36091Shared CWE-283
CVE-2025-47940Shared CWE-283
CVE-2026-93853Shared CWE-283
CVE-2026-40337Shared CWE-283
CVE-2023-6068Shared CWE-283
CVE-2026-110237Shared CWE-283
CVE-2025-12815Shared CWE-283

Affected Assets

Mitigating Controls

Control response

Prevent
Stop it (NIST 800-53)

—

Detect
Catch it (NIST detect / respond)

—

Harden
Shrink the surface (DISA STIG)
  • 3 hardening rules · 3 OS baselines
Validate
Prove the fix (OWASP ASVS)

—

Mitigating Controls (NIST 800-53 r5) AI

AC-16 Security and Privacy Attributes partial match

Associating ownership as a security attribute enables subsequent verification of resource ownership.

AC-24 Access Control Decisions partial match

Requiring access decisions to consider all relevant attributes includes ownership verification.

AC-25 Reference Monitor partial match

A reference monitor provides the tamperproof mechanism that can enforce ownership checks.

AC-3 Access Enforcement partial match

Access enforcement directly requires verifying ownership before granting access to resources.

Mitigating Controls (NIST CSF 2.0) AI

Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→CSF cross-walk (authority under review) — links open the control.

PR.AA-05 partial match
blocks

Enforcing defined access permissions and authorizations directly prevents missing ownership verification for resources.

Mitigating Controls (ISO/IEC 27001:2022 Annex A) AI

Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→ISO cross-walk (authority under review) — links open the control.

A.5.15 Access control partial match
blocks

Access control policies can require ownership verification before granting access to critical resources.

A.5.16 Identity management partial match
degrades

Identity management processes can include verification of resource ownership during provisioning and access decisions.

A.5.18 Access rights partial match
blocks

A.5.18 governs the provisioning, review, and revocation of access rights based on authorization and policy; it does not verify resource ownership and cannot stop exploitation of unverified ownership.

A.8.19 Installation of software on operational systems partial match
removes
A.8.2 Privileged access rights partial match
blocks

A.8.2 controls the allocation, review, expiry and use of privileged rights via authorization and least-privilege rules; it has no bearing on whether a resource's ownership is verified before use, so the CWE-283 weakness can still be present and exploited.

A.8.26 Application security requirements partial match
removes

Hardening callouts derived

Configuration rules from DISA STIG baselines that bear on weaknesses of the type cited by this CVE. Each rule is shown with the relationship its mapping actually records, against the CWE it was authored against. Derived via CVE→CWE over `controls_xwalks` (higher-evidence rows only; rows rated `none` are excluded).

Windows Server 2016 (1 rule)
  • V-224831 Local volumes must use a format that supports NTFS attributes. blocks CWE-283
Windows Server 2019 (1 rule)
  • V-205663 Windows Server 2019 local volumes must use a format that supports NTFS attributes. blocks CWE-283

References