CVE-2026-20812 Details
Description
Improper input validation in Windows LDAP - Lightweight Directory Access Protocol allows an authorized attacker to perform tampering over a network.
A tampering vulnerability has been identified in the Windows Lightweight Directory Access Protocol (LDAP) implementation. This issue arises from improper input validation, allowing an authorized attacker to manipulate data over the network. The vulnerability affects multiple Windows versions and could potentially be exploited to alter LDAP operations or data.
Users can apply the security updates provided by Microsoft to address this vulnerability. These security updates can be downloaded via the Microsoft Update Catalog. Specific update details can be found in the Microsoft Knowledge Base articles linked within the update guide.
Metrics
CVSS 4.0 Severity and Vector Strings:
No CVSS 4.0 data is available for this CVE.
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
CISA-ADP
Assessed Jan 13, 2026References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-20812 | [email protected] | Vendor Advisory |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-20 | Improper Input Validation | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| microsoft windows 10 1607 | < 10.0.14393.8783 |
CPE
Remediation
| |
| microsoft windows 10 1809 | < 10.0.17763.8276 |
CPE
Remediation
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| microsoft windows 10 21h2 | < 10.0.19044.6809 |
CPE
Remediation
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| microsoft windows 10 22h2 | < 10.0.19045.6809 |
CPE
Remediation
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| microsoft windows 11 23h2 | < 10.0.22631.6491 |
CPE
Remediation
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| microsoft windows 11 24h2 | < 10.0.26100.7623 |
CPE
Remediation
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| microsoft windows 11 25h2 | < 10.0.26200.7623 |
CPE
Remediation
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| microsoft windows server 2016 | < 10.0.14393.8783 |
CPE
Remediation
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| microsoft windows server 2019 | < 10.0.17763.8276 |
CPE
Remediation
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| microsoft windows server 2022 | < 10.0.20348.4648 |
CPE
Remediation
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| microsoft windows server 2022 23h2 | < 10.0.25398.2092 |
CPE
Remediation
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| microsoft windows server 2025 | < 10.0.26100.32230 |
CPE
Remediation
| |
Change History
5 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jul 30, 2026 | CVE Modified | [email protected] |
| Jun 17, 2026 | CVE Modified | [email protected] |
| Jun 17, 2026 | CVE Modified | CISA-ADP |
| Jan 14, 2026 | Initial Analysis | [email protected] |
| Jan 13, 2026 | New CVE Received | [email protected] |