Patch tracker / CVE reference / CVE-2026-118154
CVE-2026-118154
CVE-2026-118154 is a Microsoft vulnerability that Microsoft rates Important, with a CVSS score of 8.8 (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Our data comes from Microsoft, CISA and other public sources, and it can be wrong or out of date.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 8.8 (High). Fixed by 1 Microsoft security update.
Risk summary
Not in the CISA KEV catalog. EPSS exploit probability Not scored. CVSS 8.8 (High).
CVE-2026-118154 is an Elevation of Privilege flaw in Microsoft Exchange Server Subscription Edition RTM, the only affected build named. It is rated High Severity (CVSS 8.8) but is not in the CISA KEV catalog and has no known ransomware use, so there is no confirmed exploitation today. Exchange is a high-value, internet-adjacent target, so a privilege escalation here would let an attacker who already has a foothold climb to higher rights on the mail server.
Do this: Inventory your Exchange Server Subscription Edition RTM servers today, apply the Microsoft security update for CVE-2026-118154 as soon as it is validated, and check the CISA KEV catalog for any change in exploitation status.
AI-generated from public data, 2026-11-10. Verify against the vendor advisory before acting.
Senserva AI Opinion and rich prompt for CVE-2026-118154
Copy this prompt into Claude, ChatGPT, or Copilot. The facts are included, sourced from this page.
Official patch(es) for CVE-2026-118154
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-2026-118154. 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
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