CVE-2026-69508: Microsoft Windows 11 Version 24H2

Windows MIDI Service Module Elevation of Privileges Vulnerability

CVSS 7.8 HighEPSS 0.0033 · 26th percentile

Published by the CVE Program (CNA: microsoft) at 8 Sept 2026, 17:15 UTC. agentprime has not analysed this yet, so whether it affects any app is not known. This CVE names a vendor and product rather than a package, so the lockfile check doesn’t match it.

Affected products, as the CNA wrote them
Vendor	Product	Versions
Microsoft	Windows 11 Version 24H2	affected 10.0.26100.0 to before 10.0.26100.9445 custom
Microsoft	Windows 11 Version 25H2	affected 10.0.26200.0 to before 10.0.26200.9445 custom
Microsoft	Windows 11 version 26H1	affected 10.0.28000.0 to before 10.0.28000.2954 custom

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

Windows MIDI Service Module in Windows 11 versions 24H2, 25H2 and 26H1 is affected before builds 10.0.26100.9445, 10.0.26200.9445 and 10.0.28000.2954 respectively. A local attacker with low-privilege access can exploit a stack-based buffer overflow to gain elevated privileges. Upgrade to the fixed build for your Windows version; the source gives no workaround.

Written 11 Nov 2026.

Not analysed yet

We haven’t published our own analysis of this CVE. If a person reviews it, this page will say what’s affected and what has to be true for it to matter.

Severity and exploitation

Score	Rating	CVSS	Vector	Source
7.8	High	3.1	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C	CNA (microsoft)

CISA KEV Not listed.
EPSS 0.0033, the 26th percentile, on 11 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

8 Sept 2026, 17:15 UTC Confirmed by the CVE List
31 Oct 2026, 16:26 UTC First seen by agentprime

Sources

References from the CNA

msrc.microsoft.com/update-guide/vulnerability/CVE-2026-69508 vendor-advisorypatch

Facts on this page come from the CVE List as the CNA published them, with CVSS from the sources named above, CISA KEV and FIRST EPSS. Vendors, products and versions are shown as the CNA wrote them. We don’t reproduce the CVE’s description.