# CVE-2026-20833: Windows Kerberos Information Disclosure Vulnerability CVE-2026-20833 is fixed in 19 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-2026-20833 - Priority: Routine - CVSS: 5.5 (Important) - EPSS: 0.0053 - CISA KEV: not listed - Exploited (vendor report): no - Publicly disclosed: no - Vendor exploitability assessment: Exploitation Less Likely - Published: Jan 13, 2026 - Weakness: Use of a Broken or Risky Cryptographic Algorithm - Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-20833 ## Description

Use of a broken or risky cryptographic algorithm in Windows Kerberos allows an authorized attacker to disclose information locally.

## Where it's fixed | Platform | Product | Fixed in | Fix | Released | |---|---|---|---|---| | Microsoft | Windows Server 2008 R2 for x64-based Systems Service Pack 1 | | [KB5073699](https://patchblox.com/security/data/fix/microsoft/kb5073699.md) | Jan 13, 2026 | | Microsoft | Windows Server 2008 R2 for x64-based Systems Service Pack 1 | | [KB5073695](https://patchblox.com/security/data/fix/microsoft/kb5073695.md) | Jan 13, 2026 | | Microsoft | Windows Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core installation) | | [KB5073699](https://patchblox.com/security/data/fix/microsoft/kb5073699.md) | Jan 13, 2026 | | Microsoft | Windows Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core installation) | | [KB5073695](https://patchblox.com/security/data/fix/microsoft/kb5073695.md) | Jan 13, 2026 | | Microsoft | Windows Server 2008 for 32-bit Systems Service Pack 2 | | [KB5073700](https://patchblox.com/security/data/fix/microsoft/kb5073700.md) | Jan 13, 2026 | | Microsoft | Windows Server 2008 for 32-bit Systems Service Pack 2 | | [KB5073697](https://patchblox.com/security/data/fix/microsoft/kb5073697.md) | Jan 13, 2026 | | Microsoft | Windows Server 2008 for 32-bit Systems Service Pack 2 (Server Core installation) | | [KB5073700](https://patchblox.com/security/data/fix/microsoft/kb5073700.md) | Jan 13, 2026 | | Microsoft | Windows Server 2008 for 32-bit Systems Service Pack 2 (Server Core installation) | | [KB5073697](https://patchblox.com/security/data/fix/microsoft/kb5073697.md) | Jan 13, 2026 | | Microsoft | Windows Server 2008 for x64-based Systems Service Pack 2 | | [KB5073700](https://patchblox.com/security/data/fix/microsoft/kb5073700.md) | Jan 13, 2026 | | Microsoft | Windows Server 2008 for x64-based Systems Service Pack 2 | | [KB5073697](https://patchblox.com/security/data/fix/microsoft/kb5073697.md) | Jan 13, 2026 | | Microsoft | Windows Server 2008 for x64-based Systems Service Pack 2 (Server Core installation) | | [KB5073700](https://patchblox.com/security/data/fix/microsoft/kb5073700.md) | Jan 13, 2026 | | Microsoft | Windows Server 2008 for x64-based Systems Service Pack 2 (Server Core installation) | | [KB5073697](https://patchblox.com/security/data/fix/microsoft/kb5073697.md) | Jan 13, 2026 | | Microsoft | Windows Server 2012 | | [KB5073698](https://patchblox.com/security/data/fix/microsoft/kb5073698.md) | Jan 13, 2026 | | Microsoft | Windows Server 2012 (Server Core installation) | | [KB5073698](https://patchblox.com/security/data/fix/microsoft/kb5073698.md) | Jan 13, 2026 | | Microsoft | Windows Server 2012 R2 | | [KB5073696](https://patchblox.com/security/data/fix/microsoft/kb5073696.md) | Jan 13, 2026 | | Microsoft | Windows Server 2012 R2 (Server Core installation) | | [KB5073696](https://patchblox.com/security/data/fix/microsoft/kb5073696.md) | Jan 13, 2026 | | 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 | --- Data as of 2026-11-08T13:06:02Z 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 Free to use with attribution: show "Data: Patchblox Patch Radar" with a link to https://patchblox.com/security/patch-radar. Terms, including what needs a written agreement: https://patchblox.com/security/patch-radar/use-the-data Product names, logos and trademarks shown on Patch Radar belong to their respective owners. They are used only to identify the software each security fix applies to and to help readers find their platform. Their use does not imply any affiliation with, or endorsement by, those owners, and Patchblox is not affiliated with any of them.