Patch tracker / KB5002826

KB5002826: Microsoft SharePoint Server 2019 Security Update (January 2026)

KB5002826 is a High security update for Microsoft SharePoint Server 2019, released 2026-01-13. It closes 3 CVEs with a maximum CVSS of 8.4. The most likely of them to be attacked is CVE-2026-20943, which FIRST.org rates at 32% probability of exploitation in the next 30 days.

Update summary

High
2026-01-13
Released
3
CVEs fixed
8.4
Max CVSS
High
Severity
Deploy this cycle
Fixes 3 CVEs for Microsoft SharePoint Server 2019. No confirmed in-the-wild exploitation in this set today.

Fixes 3 CVEs. Most severe CVSS 8.4 (High). EPSS exploit probability up to <1%. Among the lower half of tracked Microsoft updates by EPSS exploit probability.

Senserva found thiswe track every release for this product line, so we can tell you this package is behind

A newer security update for Microsoft SharePoint Server 2019 has shipped since this one: KB5002882 (2026-08-11). For cumulative update families the newer package includes these fixes, so installing that one is usually the shorter path. Verify against your own update rings before you skip this package.

Microsoft Update Catalog: download KB5002826Microsoft support article
Senserva AI Opinion for KB5002826

KB5002826 patches three CVEs across SharePoint Server 2019 and both 32-bit and 64-bit Office 2016, with the worst rated High severity at CVSS 8.4. The SharePoint component matters most here because a server-side flaw exposes an internet-facing collaboration platform, not just individual desktops. None of the three CVEs are in CISA KEV or linked to ransomware, and EPSS tops out at 1 percent, so this is a plan-and-deploy patch rather than an emergency scramble.

Do this: Schedule KB5002826 for your SharePoint Server 2019 farm first, then roll the Office 2016 32-bit and 64-bit updates through your normal workstation ring.

AI-generated from public data, 2026-07-21. Verify against the vendor advisory before acting.

Senserva AI Opinion and rich prompt for KB5002826

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

Full tracking and change history for KB5002826

Released
2026-01-13
Last changed
2026-01-13
Changes tracked
1

Senserva began recording day-to-day change history on 2026-07-07, and refreshes it several times a day. Release dates are historical where Microsoft publishes them; revision history is tracked from that date forward, so it does not include changes made before then.

Check if KB5002826 is installed

Elevated PowerShell. No output means it is not installed.

CVEs fixed by this update

Sorted exploited-first, then by CVSS. Every CVE links to its Senserva page with the full risk facts, references, and a ready-to-paste AI prompt.

CVESeverityCVSSEPSSExploited
CVE-2026-20952High8.4<1%No
CVE-2026-20953High8.4<1%No
CVE-2026-20943High7.032%No

Scope and sources

Affected products
Also released in January 2026

KB5002822

6 CVEs · Critical · exploited

KB5002825

7 CVEs · Critical · exploited

KB5002828

7 CVEs · Critical · exploited

KB5073379

86 CVEs · Critical · exploited

KB5073450

80 CVEs · Critical · exploited

KB5073455

80 CVEs · Critical · exploited

KB5073457

78 CVEs · Critical · exploited

KB5073722

54 CVEs · Critical · exploited

The full month, summarized: Microsoft Patch Tuesday.

Authoritative references
Official KB5002826 page (Microsoft Support)Microsoft Update CatalogMicrosoft Security Update Guide

See this and every Microsoft update ranked by real-world risk on the Microsoft Patch Tracker.

New to a term on this page? CVE, KB, KEV, CVSS, and EPSS are each explained once, on the Senserva security lexicon. Reference: Microsoft CVE and vulnerability management and the Microsoft patching guide.
Provided as is, without warranty; verify against the vendor advisory before acting. Data notice and terms.