Patch tracker / CVE reference / CVE-2026-118157
CVE-2026-118157
CVE-2026-118157 is a Microsoft vulnerability that Microsoft rates Important, with a CVSS score of 7.2 (High). Microsoft has shipped the fix: deploy the update below from the Microsoft Update Catalog, and see where this CVE sits against the rest on the patch tracker.
Our data comes from Microsoft, CISA and other public sources, and it can be wrong or out of date. If you are unsure, check the linked source before you act, and tell us when we are wrong so we can fix it.
Microsoft rates it Important. CVSS 7.2 (High). Fixed by 1 Microsoft security update.
Risk summary
Not in the CISA KEV catalog. EPSS exploit probability Not scored. CVSS 7.2 (High).
CVE-2026-118157 is an elevation of privilege flaw in Microsoft Exchange Server Subscription Edition RTM, rated High Severity at CVSS 8.8. Only the Subscription Edition RTM build is named as affected, so organizations running other Exchange versions are not covered by this advisory. It is not in the CISA KEV catalog and has no known ransomware use, so there is no confirmed exploitation today, but Exchange servers are a high-value target and privilege escalation on a mail server can expose mailbox data and domain-connected resources.
Do this: Inventory your Exchange servers to find any running Subscription Edition RTM, then apply the Microsoft security update for CVE-2026-118157 to those servers as soon as it passes testing.
AI-generated from public data, 2026-11-10. Verify against the vendor advisory before acting.
Senserva AI Opinion and rich prompt for CVE-2026-118157
Copy this prompt into Claude, ChatGPT, or Copilot. The facts are included, sourced from this page.
Official patch(es) for CVE-2026-118157
Moderate priority: schedule it in your normal patch cycle. In Intune or Defender, confirm whether the fixing update KB5133453 are installed across the affected products. Senserva does this automatically across your tenant and flags every missing patch.
Apply the Microsoft security update below to fix CVE-2026-118157. 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.
Scope and sources
- Affected products
- Fixed by the same update
- Authoritative references
Want every Microsoft CVE and the patches that fix it, ranked by real-world risk? See the Microsoft Patch Tracker.