CVE-2026-58634Patch(microsoft / windows_11_26h1)

LOWCVSS 7.8 · HIGH

Signal is active with 1 mentions in latest observed window

Immediate actions

Patch microsoft windows_11_26h1 systems immediately

Recommended action window: Monitor and triage in normal cycle

NVD description

Use after free in Desktop Window Manager allows an authorized attacker to elevate privileges locally.

microsoft CVEs Back to dashboard

0.5/ 10 priority

Sources & remediation

Patch / fix

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-58634

Weakness type (CWE)

CWE-416

Priority

LOW

Exploitation

NONE

PoC

NONE

Patch

AVAILABLE

Momentum

NONE

Are you affected?

If you run products in this scope, you should treat this CVE as relevant to your environment.

windows_11_26h1

Threat summary

Patch or workaround signal is available
1 mentions across 1 observed day

What's happening

Patch or workaround mentioned in 1 signal
Technical details provided in 1 signal
1 total mentions across 1 day

Affected systems

Vendors

microsoft

Products

windows_11_26h1

Deep dive

Activity timeline1 mentions / 1d

Signal classification1 categories

Patch

1100.0%

Referenced assets1 URL

By indicator

https://windowsforum.com/threads/kb5101649-fixes-windows-11-26h1-dwm-elevation-bug-cve-2026-58634.438871/?utm_source=x&utm_medium=social&utm_campaign=news_node84

Full discourse1 post

Windows Forum@windowsforum97d
Patch
🪟 Windows 11 26H1 users: KB5101649 patches a high-severity DWM elevation bug. Install it—“use-after-free” should describe your old PC, not an exploitable flaw. https://windowsforum.com/threads/kb5101649-fixes-windows-11-26h1-dwm-elevation-bug-cve-2026-58634.438871/?utm_source=x&utm_medium=social&utm_campaign=news_node84 #Windows11 #PatchTuesday #Kb5101649 #Cve202658634 https://t.co/zSmkLkYswt
Post summary
The tweet announces that the KB5101649 patch resolves CVE-2026-58634, a high‑severity use‑after‑free bug in Windows 11 DWM, and urges users to install it.
0000038
1.2K followersView on X

CPE platform detail2 entries

Part:

Vendor:

Product:

Version:

Target SW:

Target HW:

2 of 2 entries

Part	Vendor	Product	Version	Target SW	Target HW
OS	microsoft	windows_11_26h1	-	-	arm64
OS	microsoft	windows_11_26h1	-	-	x64

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