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CVE-2026-20833

Windows Kerberos Information Disclosure Vulnerability

MEDIUM
5.5
CVSS Score
Published: January 13, 2026 at 05:56 PM UTC
Updated: June 17, 2026 at 10:17 AM UTC
8 products affected across 1 vendorWindows Server 2016Windows Server 2019Windows Server 2012

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Severity
MEDIUM5.5
Exploit prediction
EPSS 0.5%
SSVC
No known exploit

Description

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

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Windows Server 2008· Microsoft
95%
6.0.6003.0 ≤ v < 6.0.6003.237176.1.7601.0 ≤ v < 6.1.7601.281176.0.6003.06.1.7601.0r2 sp1sp2
Affected range stops below 6.0.6003.23717, so it looks safe — our inference, not a vendor statement
Affected range stops below 6.1.7601.28117, so it looks safe — our inference, not a vendor statement
Windows Server 2012· Microsoft
95%
6.2.9200.0 ≤ v < 6.2.9200.258686.3.9600.0 ≤ v < 6.3.9600.229686.2.9200.06.3.9600.0r2
Affected range stops below 6.2.9200.25868, so it looks safe — our inference, not a vendor statement
Affected range stops below 6.3.9600.22968, so it looks safe — our inference, not a vendor statement
Windows Server 2016· Microsoft
95%
v < 10.0.14393.878310.0.14393.0 ≤ v < 10.0.14393.878310.0.14393.0
Affected range stops below 10.0.14393.8783, so it looks safe — our inference, not a vendor statement
Windows Server 2019· Microsoft
95%
v < 10.0.17763.827610.0.17763.0 ≤ v < 10.0.17763.827610.0.17763.0
Affected range stops below 10.0.17763.8276, so it looks safe — our inference, not a vendor statement
Windows Server 2022· Microsoft
95%
v < 10.0.20348.464810.0.20348.0 ≤ v < 10.0.20348.464810.0.20348.0
Affected range stops below 10.0.20348.4648, so it looks safe — our inference, not a vendor statement
Windows Server 2022 23H2· Microsoft
95%
v < 10.0.25398.209210.0.25398.0 ≤ v < 10.0.25398.209210.0.25398.0
Affected range stops below 10.0.25398.2092, so it looks safe — our inference, not a vendor statement
Windows Server 2025· Microsoft
95%
v < 10.0.26100.3223010.0.26100.0 ≤ v < 10.0.26100.3223010.0.26100.0
Affected range stops below 10.0.26100.32230, so it looks safe — our inference, not a vendor statement
Windows Server 23H2· Microsoft
95%
10.0.25398.0 ≤ v < 10.0.25398.2092
Affected range stops below 10.0.25398.2092, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (1)

Vendor AdvisoryPatch
Source: cverecord
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-20833

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

5.5MEDIUMmicrosoft
Vector?

Quick Info

StatusANALYZED
CWE
CWE-327

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