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Windows Camera Frame Server Monitor: Heap overflow allows local privilege escalation

CVE-2026-88238High 7.8

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Summary

A heap-based buffer overflow (CWE-122) in the Windows Camera Frame Server Monitor component allows an authorized local user to elevate privileges. An attacker needs valid low-privileged access to the system and must run code on the machine, for example through a phishing payload or malware. No user interaction is required. Microsoft rates the flaw as Important, with a CVSS 3.1 base score of 7.8.

Affected

  • Windows 11 version 23H2: 10.0.22631.0 to before 10.0.22631.7711
  • Windows 11 version 24H2: 10.0.26100.0 to before 10.0.26100.9974
  • Windows 11 version 25H2: 10.0.26200.0 to before 10.0.26200.9974
  • Windows 11 version 26H1: 10.0.28000.0 to before 10.0.28000.3501
  • Windows 11 version 26H2: 10.0.26300.0 to before 10.0.26300.9974
  • Windows Server 2025 (including Server Core): 10.0.26100.0 to before 10.0.26100.33822

Fixed in

Install the November 2026 security update for each affected branch. Fixed builds: Windows 11 23H2 10.0.22631.7711, 24H2 10.0.26100.9974, 25H2 10.0.26200.9974, 26H1 10.0.28000.3501, 26H2 10.0.26300.9974, Windows Server 2025 10.0.26100.33822. Check the MSRC Security Update Guide for the exact build numbers before rollout.

Workaround

No workaround is documented by Microsoft. Patching is the primary fix.

  • Unconfirmed option for systems without camera use: disable the Windows Camera Frame Server service. Microsoft has not confirmed this for this CVE.

Exploitation

  • Microsoft rates exploitation as not exploited and exploit code maturity as Unproven.
  • CISA SSVC: Exploitation none, Automatable no, Technical Impact total.
  • No public proof of concept and no CISA KEV entry found at the time of research.

Our recommendation

  • Install the November 2026 cumulative update on Windows 11 and Windows Server 2025 systems in the normal patch cycle, and prioritise systems used for untrusted files or email.
  • Check the MSRC page for the exact fixed build of each branch.
  • Monitor for a public proof of concept or KEV addition, which would raise the priority.
  • Where camera functions are not needed, such as on servers and kiosks, consider disabling the service after testing.

Information from Microsoft (Patch Tuesday November 2026)

Severity (Microsoft)
Important
Impact
Elevation of privilege – Windows Camera Frame Server Monitor
Status on Patch Tuesday
Neither exploited nor publicly disclosed
Exploitability assessment
Exploitation more likely
Product family
Windows
Updates (KB)
KB5131087, KB5132061, KB5132043, KB5131080, KB5131077, KB5132059

Entry in the Microsoft Security Update Guide

Public exploits

PoC-in-GitHub, Metasploit and Exploit-DB list nothing for this CVE.

Research sources

Researched and written up in English and German by an AI (Claude by Anthropic) based on NVD, CISA, EPSS and the sources listed. The vendor information is authoritative. Researched on 11 Nov 2026, 03:17.

Original description (NVD)

Heap-based buffer overflow in Windows Camera Frame Server Monitor allows an authorized attacker to elevate privileges locally.

NVD references (1)

Sources

The tracker combines official, freely usable data sources – updated continuously:

This product uses data from the NVD API but is not endorsed or certified by the NVD. EPSS data © FIRST.org.

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