# CVE-2026-20818: Windows Kernel Information Disclosure Vulnerability

CVE-2026-20818 is fixed in 9 products on 1 platform, first by KB5073722, released January 13, 2026. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2026-20818
- Priority: Routine
- CVSS: 6.2 (Important)
- EPSS: 0.0071
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Vendor exploitability assessment: Exploitation Unlikely
- Published: Jan 13, 2026
- Weakness: Insertion of Sensitive Information into Log File
- Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-20818

## Description

<p>Insertion of sensitive information into log file in Windows Kernel allows an unauthorized attacker to disclose information locally.</p>

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Microsoft | Windows Server 2016 | 14393.8783 | [KB5073722](https://patchblox.com/security/data/fix/microsoft/kb5073722.md) | Jan 13, 2026 |
| Microsoft | Windows Server 2016 (Server Core installation) | 14393.8783 | [KB5073722](https://patchblox.com/security/data/fix/microsoft/kb5073722.md) | Jan 13, 2026 |
| Microsoft | Windows Server 2019 | 17763.8276 | [KB5073723](https://patchblox.com/security/data/fix/microsoft/kb5073723.md) | Jan 13, 2026 |
| Microsoft | Windows Server 2019 (Server Core installation) | 17763.8276 | [KB5073723](https://patchblox.com/security/data/fix/microsoft/kb5073723.md) | Jan 13, 2026 |
| Microsoft | Windows Server 2022 | 20348.4648 | [KB5073457](https://patchblox.com/security/data/fix/microsoft/kb5073457.md) | Jan 13, 2026 |
| Microsoft | Windows Server 2022 (Server Core installation) | 20348.4648 | [KB5073457](https://patchblox.com/security/data/fix/microsoft/kb5073457.md) | Jan 13, 2026 |
| Microsoft | Windows Server 2022, 23H2 Edition (Server Core installation) | 25398.2092 | [KB5073450](https://patchblox.com/security/data/fix/microsoft/kb5073450.md) | Jan 13, 2026 |
| Microsoft | Windows Server 2025 | 26100.32230 | [KB5073379](https://patchblox.com/security/data/fix/microsoft/kb5073379.md) | Jan 13, 2026 |
| Microsoft | Windows Server 2025 (Server Core installation) | 26100.32230 | [KB5073379](https://patchblox.com/security/data/fix/microsoft/kb5073379.md) | Jan 13, 2026 |

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Data as of 2026-11-08T19:12:23Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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