Vulnerabilities
CVE-2026-83650: Windows Media Heap Overflow Enables Local Privilege Escalation
A heap‑based buffer overflow in Windows Media components allows an authorized user to elevate privileges on the local machine. The flaw is present in all Windows 10/11 builds that ship with the Media Foundation runtime. Defenders should apply the latest MSRC update and enforce least‑privilege for media services.
What happened
A heap‑based buffer overflow was discovered in the Windows Media component of the Media Foundation runtime. By supplying a specially crafted media file, an attacker with local user rights can trigger the overflow and gain elevated privileges on the affected system.
Impact
The vulnerability is exploitable only by users who can run media files locally. Successful exploitation results in privilege escalation, enabling the attacker to execute arbitrary code with SYSTEM rights. All Windows 10 and Windows 11 installations that include the default Media Foundation runtime are affected.
Mitigation
- Install the latest security update from Microsoft Security Response Center (MSRC) that patches CVE-2026-83650.
- Restrict user permissions for media playback applications; run them with the least privilege necessary.
- Disable or remove the Media Foundation runtime on systems that do not require media playback.
- Monitor for anomalous privilege escalation events and enforce application whitelisting for media players.
Related vulnerabilities
CVE-2026-70114: Windows Kernel Heap Overflow Enables Local Privilege Escalation
Microsoft has identified a heap-based buffer overflow in the Windows kernel that allows an authorized local user to gain SYSTEM privileges. The vulnerability affects Windows 10, 11, and Windows Server 2016/2022. Defenders should apply the latest cumulative update and enforce least‑privilege controls.
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CVE‑2026‑83678: Windows TCP/IP Heap Overflow Enables Local Privilege Escalation
A heap‑based buffer overflow in the Windows TCP/IP stack (CVE‑2026‑83678) allows a local attacker with authorized access to elevate privileges. Microsoft has issued a patch; administrators should apply it immediately and tighten local privilege controls.
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Windows Media Elevation of Privilege via Heap Buffer Overflow (CVE-2026-83641)
A heap‑based buffer overflow in Windows Media allows a local user with sufficient privileges to gain SYSTEM rights. The flaw is present in all Windows 10/11 and Server 2022 builds that include Windows Media. Apply the Microsoft security update or disable Windows Media to mitigate.
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CVE-2026-70108: Windows Win32k Heap Overflow Enables Local Privilege Escalation
Microsoft disclosed CVE‑2026‑70108, a heap‑based buffer overflow in the Win32 kernel subsystem that lets an authenticated local user elevate privileges. The flaw is present in all current Windows releases until patched. Defenders should apply the latest cumulative update and monitor for anomalous privilege changes.
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