CVE-2026-50350 exposes sensitive information through the Windows Trusted Runtime Interface Driver, with fixes delivered across Windows 10, Windows 11, and Windows Server 2025. Microsoft published the vulnerability on July 14, 2026, as part of its monthly security release, and administrators should verify that affected machines have reached the corrected OS build rather than relying only on a successful Windows Update check.
Detailed in Microsoft’s Security Update Guide, the flaw requires an attacker to authenticate and execute code locally. It is not a remote-code-execution route, but Microsoft’s CVSS assessment gives it a base score of 5.5 and rates the confidentiality impact as high, indicating that successful exploitation could expose information the attacker should not be able to access.
The National Vulnerability Database had marked the record as awaiting enrichment shortly after publication. Its initial entry reproduces Microsoft’s affected-version data and classifies the weakness as CWE-200, Exposure of Sensitive Information to an Unauthorized Actor.
Microsoft’s CVSS vector for CVE-2026-50350 is
The vulnerability does not directly provide elevated privileges, alter protected data, or make Windows unavailable. Its stated effect is disclosure, with no integrity or availability impact represented in the score. That distinction matters when triaging a large Patch Tuesday queue, but it should not turn the issue into an indefinite deferral.
Information-disclosure flaws are frequently useful as components in broader attack chains. Data exposed from a trusted runtime or kernel-adjacent interface could potentially help an attacker understand system state, obtain sensitive material, or weaken mitigations needed to exploit another vulnerability. Microsoft has not publicly documented the precise information returned by the driver or published proof-of-concept code, so the value of the disclosure to a real attacker remains uncertain.
The supplied attack conditions also mean an unauthenticated internet user cannot directly target the driver over the network. An adversary would first need local execution and an authorized, low-privilege context, whether obtained through malware, a compromised account, an exposed remote-management service, or another vulnerability.
That makes endpoint compromise the prerequisite, not the final consequence. Multi-user workstations, administrative jump boxes, virtual desktop infrastructure, development systems, and servers that run third-party workloads deserve more attention than tightly controlled single-purpose devices.
The corrected releases are:
Windows 10 receives KB5099539, producing builds 19044.7548 and 19045.7548. Microsoft’s support documentation notes that Windows 10 version 22H2 passed its general end-of-support date on October 14, 2025, so continued security coverage depends on an eligible Extended Security Updates deployment or a supported servicing edition such as Enterprise LTSC.
The Windows 11 26H1 entry is unusual because Microsoft lists build 28000.2269 as the corrected boundary, a build released in June 2026. July’s KB5101649 moves 26H1 devices further ahead to build 28000.2525. In practical terms, a fully updated 26H1 machine should already exceed the vulnerable range, but administrators should still confirm the installed revision.
Build numbers can be checked through
Report confidence should not be confused with exploitability or evidence of active attacks. A confirmed defect can remain difficult to weaponize, while a less thoroughly documented vulnerability can still be exploited in the wild. The metric says that defenders and attackers can rely on the vulnerability record as genuine; it does not establish that exploit code is available.
As of the initial July 14 publication, the public record contains limited technical detail. Microsoft has not described the vulnerable driver operation, the type of information exposed, or the system configuration needed to reach the affected path. The NVD also had not completed an independent assessment beyond ingesting Microsoft’s CVE data.
That lack of detail reduces immediate opportunities for defenders to create a precise behavioral detection. There is no documented malicious filename, command line, event ID, registry value, or network signature tied specifically to CVE-2026-50350. Endpoint detection teams should therefore continue looking for the prerequisite behavior: unexpected local code execution, suspicious driver interaction, credential misuse, and low-privilege processes probing protected system resources.
Enterprise administrators should prioritize normal deployment rings rather than bypassing testing solely because the confidentiality impact is high. The July updates include other security and hardening changes, and cumulative-update compatibility must be evaluated against VPN clients, endpoint security agents, line-of-business applications, drivers, and server workloads.
A sensible rollout should still move quickly: validate the update on representative hardware, deploy it to exposed and high-value systems, check installation and reboot compliance, and then identify devices stranded below the corrected revision. Systems that repeatedly report an installed update while retaining an older build require servicing-stack, policy, disk-space, or component-store investigation.
CVE-2026-50350 is not presented as a remote emergency, but its low-complexity local attack path and high confidentiality impact make prolonged exposure unnecessary. For Windows 11 24H2 and 25H2, builds 26100.8875 and 26200.8875 are the immediate line to enforce; for Server 2025, the corresponding target is 26100.33158.
Detailed in Microsoft’s Security Update Guide, the flaw requires an attacker to authenticate and execute code locally. It is not a remote-code-execution route, but Microsoft’s CVSS assessment gives it a base score of 5.5 and rates the confidentiality impact as high, indicating that successful exploitation could expose information the attacker should not be able to access.
The National Vulnerability Database had marked the record as awaiting enrichment shortly after publication. Its initial entry reproduces Microsoft’s affected-version data and classifies the weakness as CWE-200, Exposure of Sensitive Information to an Unauthorized Actor.
Local Access Limits the Door, Not the Damage
Microsoft’s CVSS vector for CVE-2026-50350 is CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N. That compact string defines a relatively narrow but credible attack path: exploitation is local, requires low privileges, has low attack complexity, and needs no action from another user.The vulnerability does not directly provide elevated privileges, alter protected data, or make Windows unavailable. Its stated effect is disclosure, with no integrity or availability impact represented in the score. That distinction matters when triaging a large Patch Tuesday queue, but it should not turn the issue into an indefinite deferral.
Information-disclosure flaws are frequently useful as components in broader attack chains. Data exposed from a trusted runtime or kernel-adjacent interface could potentially help an attacker understand system state, obtain sensitive material, or weaken mitigations needed to exploit another vulnerability. Microsoft has not publicly documented the precise information returned by the driver or published proof-of-concept code, so the value of the disclosure to a real attacker remains uncertain.
The supplied attack conditions also mean an unauthenticated internet user cannot directly target the driver over the network. An adversary would first need local execution and an authorized, low-privilege context, whether obtained through malware, a compromised account, an exposed remote-management service, or another vulnerability.
That makes endpoint compromise the prerequisite, not the final consequence. Multi-user workstations, administrative jump boxes, virtual desktop infrastructure, development systems, and servers that run third-party workloads deserve more attention than tightly controlled single-purpose devices.
The Corrected Build Is the Useful Test
Microsoft’s affected-version ranges identify the first builds that are no longer vulnerable. For most organizations, these build thresholds provide a clearer compliance check than searching installed-update history for a particular component.The corrected releases are:
- Windows 10 version 21H2 must be on OS build 19044.7548 or later.
- Windows 10 version 22H2 must be on OS build 19045.7548 or later.
- Windows 11 version 24H2 must be on OS build 26100.8875 or later.
- Windows 11 version 25H2 must be on OS build 26200.8875 or later.
- Windows 11 version 26H1 must be on OS build 28000.2269 or later.
- Windows Server 2025, including Server Core, must be on OS build 26100.33158 or later.
Windows 10 receives KB5099539, producing builds 19044.7548 and 19045.7548. Microsoft’s support documentation notes that Windows 10 version 22H2 passed its general end-of-support date on October 14, 2025, so continued security coverage depends on an eligible Extended Security Updates deployment or a supported servicing edition such as Enterprise LTSC.
The Windows 11 26H1 entry is unusual because Microsoft lists build 28000.2269 as the corrected boundary, a build released in June 2026. July’s KB5101649 moves 26H1 devices further ahead to build 28000.2525. In practical terms, a fully updated 26H1 machine should already exceed the vulnerable range, but administrators should still confirm the installed revision.
Build numbers can be checked through
winver, Settings under System and About, PowerShell inventory, Microsoft Intune, Configuration Manager, or an endpoint vulnerability-management platform. Because Windows cumulative updates supersede earlier packages, installing a later supported cumulative update also incorporates the correction.Confidence Does Not Mean Exploit Activity
The “report confidence” language attached to the advisory describes how strongly the vulnerability’s existence and technical characterization have been established. Microsoft is the assigning CVE Numbering Authority and has acknowledged the flaw, supplied the affected products, published a CVSS vector, and shipped corrected builds. That supports a confirmed vulnerability, rather than a speculative report based only on unverified research.Report confidence should not be confused with exploitability or evidence of active attacks. A confirmed defect can remain difficult to weaponize, while a less thoroughly documented vulnerability can still be exploited in the wild. The metric says that defenders and attackers can rely on the vulnerability record as genuine; it does not establish that exploit code is available.
As of the initial July 14 publication, the public record contains limited technical detail. Microsoft has not described the vulnerable driver operation, the type of information exposed, or the system configuration needed to reach the affected path. The NVD also had not completed an independent assessment beyond ingesting Microsoft’s CVE data.
That lack of detail reduces immediate opportunities for defenders to create a precise behavioral detection. There is no documented malicious filename, command line, event ID, registry value, or network signature tied specifically to CVE-2026-50350. Endpoint detection teams should therefore continue looking for the prerequisite behavior: unexpected local code execution, suspicious driver interaction, credential misuse, and low-privilege processes probing protected system resources.
Patch Validation Matters More Than Workarounds
Microsoft has not presented a configuration workaround or standalone mitigation for CVE-2026-50350. The corrective action is to install the applicable cumulative Windows security update and verify that the device reaches or exceeds the fixed build.Enterprise administrators should prioritize normal deployment rings rather than bypassing testing solely because the confidentiality impact is high. The July updates include other security and hardening changes, and cumulative-update compatibility must be evaluated against VPN clients, endpoint security agents, line-of-business applications, drivers, and server workloads.
A sensible rollout should still move quickly: validate the update on representative hardware, deploy it to exposed and high-value systems, check installation and reboot compliance, and then identify devices stranded below the corrected revision. Systems that repeatedly report an installed update while retaining an older build require servicing-stack, policy, disk-space, or component-store investigation.
CVE-2026-50350 is not presented as a remote emergency, but its low-complexity local attack path and high confidentiality impact make prolonged exposure unnecessary. For Windows 11 24H2 and 25H2, builds 26100.8875 and 26200.8875 are the immediate line to enforce; for Server 2025, the corresponding target is 26100.33158.
References
- Primary source: MSRC
Published: 2026-07-14T07:00:00-07:00
Security Update Guide - Microsoft Security Response Center
msrc.microsoft.com
- Official source: techcommunity.microsoft.com
