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.
What happened
A heap-based buffer overflow in the Windows Error Reporting component allows an unauthenticated attacker to execute arbitrary code on a target system via a specially crafted network request.
Impact
Any Windows machine with the vulnerable Error Reporting service enabled can be compromised, potentially leading to full system takeover. The flaw does not require user interaction and can be triggered remotely.
Mitigation
- Install the latest Microsoft security update that addresses CVE‑2026‑83748.
- As an interim measure, disable the Windows Error Reporting service (wermgr) via Group Policy or local policy.
- Block inbound traffic to the Error Reporting port (default 443/HTTPS) if the service is not needed.
Recommended actions
- Verify that the update is deployed across all endpoints.
- Monitor for anomalous network traffic or unexpected process creation associated with wermgr.
- Document the change in your configuration management database.
Related vulnerabilities
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‑2026‑83758: 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.
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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-2026-102856: Visio RCE via Heap Overflow
A heap-based buffer overflow vulnerability exists in Microsoft Visio. Successful exploitation allows a remote, unauthenticated attacker to achieve arbitrary code execution. Defenders should prioritize patching Visio installations.
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