Patch tracker / CVE reference / CVE-2026-20833

CVE-2026-20833

Updated July 21, 2026. Data refreshed on every build from MSRC, CISA KEV, and FIRST EPSS.

Patch this cycle
Not confirmed exploited yet, but the 30-day exploit probability is high (EPSS 73%).
Fixed by KB5073379 and 10 more (by build, listed below). Download from the Microsoft Update Catalog, or deploy via Windows Update, Intune, or WSUS.
Do this now: Patch in this maintenance window; do not let it slip to the next one.

Critical severity Microsoft vulnerability, CVSS 9.8. Fixed by 11 Microsoft security updates.

All about CVE-2026-20833: the Senserva AI read, whether it is exploited, the official patches, its change history, and the questions admins ask.

Senserva AI read on CVE-2026-20833Official patches for CVE-2026-20833Change historyAdmin questions

CVE-2026-20833 is a critical severity Microsoft vulnerability with a CVSS score of 9.8. Its EPSS score puts the probability of exploitation in the next 30 days at 73%. Microsoft has shipped the fix: deploy one of the 11 updates below from the Microsoft Update Catalog, and see where this CVE sits against the rest on the patch tracker.

Critical

Risk summary

CVSS base
9.8
EPSS exploit probability
73%
Severity
Critical
SenservaSenserva provides Three Free Unlimited Audits, including all tenants and full Claude MCP.Start my Audit

Senserva AI Opinion for CVE-2026-20833

Kerberos appears once more here, another information disclosure flaw rated Critical 9.8 with a 73 percent EPSS score on Windows Server 2019 and Server 2022, joining several other Kerberos-related CVEs already noted in this batch. Given how many separate Kerberos findings appear across this release, domain controllers deserve a dedicated, tracked patch pass for the full set rather than treating each one individually. It has not been confirmed exploited or tied to ransomware.

Do this: Patch domain controllers for this and the other Kerberos-related CVEs in this batch as one coordinated fix.

AI-generated from public data, 2026-07-07. Verify against the vendor advisory before acting.

Senserva AI Opinion and rich prompt for CVE-2026-20833

Copy this prompt into Claude, ChatGPT, or Copilot. The facts are included, sourced from this page.

Full tracking and change history for CVE-2026-20833

Published
2026-01-13
Last revised
2026-01-13
Changes tracked
1

Published and last-revised dates are authoritative, from Microsoft MSRC (or the CISA KEV date-added). Senserva additionally records day-to-day changes from 2026-07-07, refreshed several times a day; the change count reflects that forward-only tracking.

Exploitation and severity

Not in the CISA KEV catalog. EPSS exploit probability 73%. CVSS 9.8 (Critical).

This CVE is among the top 25% of tracked Microsoft CVEs by EPSS exploit probability.

Official patch(es) for CVE-2026-20833

High priority: EPSS puts the odds of near-term exploitation high. In Intune or Defender, confirm whether the fixing updates KB5073379, KB5073450, KB5073457, KB5073695, KB5073696, KB5073697, KB5073698, KB5073699, KB5073700, KB5073722, KB5073723 are installed across the affected products. Senserva does this automatically across your tenant and flags every missing patch.

Apply the Microsoft security updates below to fix CVE-2026-20833. Each KB page carries the Microsoft Update Catalog download, Microsoft's known issues for the update, a copy-paste PowerShell check for whether it is installed, and the Senserva AI read.

KB5073379KB5073450KB5073457KB5073695KB5073696KB5073697KB5073698KB5073699KB5073700KB5073722KB5073723

Affected products

Common questions about CVE-2026-20833

Is CVE-2026-20833 actively exploited?

It is not currently listed in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score puts the probability of exploitation in the next 30 days at 73%.

What patch fixes CVE-2026-20833?

Microsoft fixed CVE-2026-20833 in KB5073379, KB5073450, KB5073457, KB5073695, KB5073696, KB5073697, KB5073698, KB5073699, KB5073700, KB5073722, KB5073723. Download from the Microsoft Update Catalog, or let Intune, Windows Update, or WSUS deliver it.

Which products are affected by CVE-2026-20833?

Windows 10 Version 1809 for 32-bit Systems, Windows 10 Version 1809 for x64-based Systems, Windows 11 Version 25H2 for ARM64-based Systems, Windows 11 Version 25H2 for x64-based Systems, Windows Server 2019, Windows Server 2019 (Server Core installation), Windows Server 2022.

Can I ask my own AI about CVE-2026-20833?

Yes. This page includes a free, ready-to-paste AI prompt containing CVE-2026-20833's key facts: severity, CVSS, EPSS exploit probability, CISA KEV status, and the fixing KB. Copy it into Claude, ChatGPT, or Copilot for a triage plan; the data is refreshed three times a day (5 AM, 12:30 PM, and 7 PM US Central).

Fixed by the same updates

If you are patching CVE-2026-20833, the same updates also fix these:

CVE-2026-20805CVE-2023-31096CVE-2024-55414CVE-2025-6965CVE-2026-0386CVE-2026-20804CVE-2026-20808CVE-2026-20809

Authoritative references

Official CVE record (cve.org)NVD detailMicrosoft MSRCFIRST.org EPSS

Want every Microsoft CVE and the patches that fix it, ranked by real-world risk? See the Microsoft Patch Tracker.

Three Free Unlimited Audits: all users, all settings, all patches, all tenants. All you do is register.

Three free audits, across every tenant you manage: 1 scan to find, 2 to review your fixes. It finds:

Includes our advanced Claude MCP: everything you need to run full audits.

Lexicon: the terms on this page
CVE
Common Vulnerabilities and Exposures. A unique ID for one publicly known vulnerability, such as CVE-2025-1234.
KB
Microsoft Knowledge Base article. The identifier for a specific Microsoft update.
KEV
CISA Known Exploited Vulnerabilities. CVEs confirmed exploited in the wild. Fix these first.
CVSS
Common Vulnerability Scoring System. A standardized Severity score from 0 to 10.
EPSS
Exploit Prediction Scoring System. The probability a CVE will be exploited in the next 30 days.
MSRC
Microsoft Security Response Center. Microsoft's Patch Tuesday advisories and KB-to-CVE mapping.
NVD
National Vulnerability Database (NIST). Authoritative CVE metadata and CVSS scores.
Ransomware
The vulnerability is linked to known ransomware activity.
Reference: Microsoft CVE and vulnerability management, the full CVE-to-patch lookup ranked by real-world risk, and the Microsoft patching guide, how Intune, Windows Autopatch, Defender, and Azure Update Manager fit together.
Data notice: this page, the feeds, and the API are provided as is, for informational purposes only, without warranty of any kind. Senserva, LLC does not guarantee the accuracy, completeness, or timeliness of third-party data (MSRC, NVD, CISA KEV, EPSS) and accepts no liability for actions taken based on it; verify against the authoritative vendor advisory before acting. Built daily with Senserva Trustworthy AI. All use of this data is subject to the Senserva EULA.