CVE-2026-83657ImportantTamperingLocal
Windows Modern Device Management (MDM) Tampering Vulnerability
Assessment
Weak authentication in Windows Modern Device Management (MDM) allows an authorized attacker to perform tampering locally.
- Severity
- Important
- CVSS base score
- 5.5CVSS:3.1/
AV:L/ AC:L/ PR:L/ UI:N/ S:U/ C:N/ I:H/ A:N/ E:U/ RL:O/ RC:C - Impact
- Tampering
- EPSS, next 30 days
- Not scored yet
- Public exploit code
- No Nuclei template lists it
- Exploitability
- Exploitation Unlikely
- Publicly disclosed
- No
- Customer action
- Required: apply the update
- Component
- Windows Modern Device Management (MDM)
- Weakness
- CWE-1390: Weak Authentication
- Issued by
- Microsoft
- Published
- 13 Oct 2026 · October 2026
- Last revised
- 13 Oct 2026
CVSS 3.1 base metricsRed raises the risk · green lowers it
- Attack vector
- LocalAV:L
- Attack complexity
- LowAC:L
- Privileges required
- LowPR:L
- User interaction
- NoneUI:N
- Scope
- UnchangedS:U
- Confidentiality
- NoneC:N
- Integrity
- HighI:H
- Availability
- NoneA:N
Updates that fix it
1 KB| KB | Type | Restart | Applies to | Other CVEs |
|---|---|---|---|---|
| KB5126651 | Security Update | Required | Windows 10 Version 1809 for 32-bit Systems, Windows 10 Version 1809 for x64-based Systems, Windows Server 2019 and 1 more | All CVEs in KB5126651 |
Affected products
WindowsWhat changed
First observed 14 Oct 2026No field changes in the recorded history.
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