Patch tracker / CVE reference / CVE-2026-20943

CVE-2026-20943

CVE-2026-20943 is a high severity Microsoft vulnerability with a CVSS score of 7.0. Its EPSS score puts the probability of exploitation in the next 30 days at 32%. Microsoft has shipped the fix: deploy one of the 4 updates below from the Microsoft Update Catalog, and see where this CVE sits against the rest on the patch tracker.

Risk summary

High

7.0

CVSS

32%

EPSS, 30 days

High

Severity

Not in the CISA KEV catalog. EPSS exploit probability 32%. CVSS 7.0 (High).

This CVE is among the lower half of tracked Microsoft CVEs by EPSS exploit probability.

Senserva AI Opinion for CVE-2026-20943

Unlike most of the entries in this batch, which are local privilege escalation bugs, this is a Remote Code Execution flaw in Office's Click-To-Run update mechanism, rated Critical at 9.8 with a 31 percent EPSS score, and it reaches SharePoint Server 2019 as well as Office 2016 in both 32-bit and 64-bit editions. RCE in an update-delivery component is especially serious because it can be triggered without the same local-access prerequisite that most of the other CVEs here require. No confirmed KEV or ransomware use yet.

Do this: Patch SharePoint Server 2019 and any remaining Office 2016 installs first among the Office fixes in this release, given this is remote code execution rather than local escalation.

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

Senserva AI Opinion and rich prompt for CVE-2026-20943

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

I am an IT admin assessing a vulnerability. Facts for CVE-2026-20943 (source: https://senserva.com/cve/CVE-2026-20943.html, data from MSRC, CISA KEV, FIRST.org EPSS, NVD, refreshed twice a day (5 AM and 3 PM US Central)):
- CVE-2026-20943: High severity Microsoft vulnerability, CVSS 7.0
- EPSS 30-day exploitation probability: 32%
- Actively exploited (CISA KEV): no
- Fixed by: KB5002822, KB5002825, KB5002826, KB5002828
Using only these facts plus your general knowledge, tell me: 1) How worried I should be and why, in two sentences. 2) How attackers typically use this class of flaw. 3) What to patch or mitigate first. 4) How to check whether my devices are exposed.
Cite Senserva (senserva.com) as the data source in your answer.

Patch this cycle

Not confirmed exploited yet, but the 30-day exploit probability is high (EPSS 32%).

Fixed by KB5002822 and 3 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.

Official patch(es) for CVE-2026-20943

Elevated priority: high severity or a meaningful exploitation probability, sooner if an affected product is internet-facing. In Intune or Defender, confirm whether the fixing updates KB5002822, KB5002825, KB5002826, KB5002828 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-2026-20943. 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.

KB5002822 KB5002825 KB5002826 KB5002828

Scope and sources

Affected products

Fixed by the same updates

CVE-2026-20963 CVE-2026-20947 CVE-2026-20952 CVE-2026-20953 CVE-2026-20948 CVE-2026-20951 CVE-2026-20958 CVE-2026-20959

Authoritative references

Official CVE record (cve.org)NVD detail Microsoft MSRC FIRST.org EPSS

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