Vulnerabilities
CVE‑2026‑83758: Windows Error Reporting Heap Overflow Enables Local Code Execution
A heap‑based buffer overflow in Windows Error Reporting can be triggered by an authorized user to run arbitrary code on the affected system. Microsoft has issued a patch; administrators should apply it or disable the service to mitigate.
What happened
A heap‑based buffer overflow in the Windows Error Reporting service can be triggered by an authorized user to execute arbitrary code locally.
Affected systems
All supported Windows 10, Windows 11, and Windows Server 2016 and newer versions are vulnerable until the security update is applied.
Impact
Once exploited, the attacker can run code with the privileges of the user account that triggered the error, potentially escalating to higher privileges if the system is not properly segmented.
What to do
Apply the Microsoft security update for CVE‑2026‑83758 immediately. If a patch cannot be applied, consider disabling the Windows Error Reporting service or restricting its execution to trusted users only. Monitor for anomalous error‑reporting activity and enforce least‑privilege policies.
Microsoft recommends applying the update immediately to prevent exploitation.
Related vulnerabilities
CVE-2026-83748: Windows Error Reporting Remote Code Execution via Heap Overflow
A heap-based buffer overflow in Windows Error Reporting enables remote code execution by unauthenticated attackers. The flaw can be exploited over a network, allowing arbitrary code execution on affected systems. Apply the latest Microsoft security update or disable the Error Reporting service to mitigate the risk.
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CVE-2026-69363: Windows Error Reporting Heap Overflow Enables Remote Privilege Escalation
A heap-based buffer overflow in Windows Error Reporting allows an authorized attacker to gain elevated privileges over a network. The flaw can be triggered by sending a crafted error report, enabling remote privilege escalation. Microsoft has issued a patch; administrators should apply updates and consider disabling or restricting Error Reporting.
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CVE-2026-83826: Windows Error Reporting Privilege Escalation Vulnerability
A local privilege escalation flaw in Windows Error Reporting allows an authenticated user to gain elevated rights by dereferencing an untrusted pointer. The issue affects all Windows 10/11 installations that have Error Reporting enabled. Apply the latest security update or disable the service to mitigate.
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CVE-2026-83715: Windows Error Reporting Tampering Vulnerability
Microsoft identified a missing authentication check in Windows Error Reporting that allows a local attacker with authorized access to tamper with error reports. The flaw can be used to modify or delete diagnostic data, potentially masking malicious activity. Defenders should apply the latest security update and consider disabling WER on systems where it is not required.
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