Patch tracker / KB5133453
KB5133453: Exchange Server Subscription Edition Security Update (November 2026)
KB5133453 is a High security update for Exchange Server Subscription Edition, released 2026-11-10. It closes 9 CVEs with a maximum CVSS of 8.8. It is the 24th largest of the 27 updates Microsoft shipped that month, by CVEs closed.
Running Exchange Server? A Windows update this month has a known issue Microsoft says affects Exchange.
“Users might be unable to sign in to OWA or send emails on Exchange Server”
Microsoft lists this on its November 2026 Windows updates: KB5131080 (Windows Server 2025), KB5131085 (Windows Server 2019), KB5131090 (Windows Server 2022), KB5131291 (Windows Server 2016).
Microsoft links: October 2026 Exchange server security updates
Quoted from Microsoft's support articles for those updates. The full text is on each update's page.
Our data comes from Microsoft, CISA and other public sources, and it can be wrong or out of date.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.
Update summary
Fixes 9 CVEs. Most severe CVSS 8.8 (High).
We checked Microsoft's support article for KB5133453 on 2026-11-12 and it lists no known issues. Read the article before broad deployment; Microsoft adds issues as reports come in, and we re-check on every refresh.
KB5133453 is the November 10, 2026 security update for Exchange Server Subscription Edition RTM and bundles fixes for nine CVEs, CVE-2026-118149 through CVE-2026-118154, CVE-2026-118157, CVE-2026-118207 and CVE-2026-118208, with a highest Severity of High (CVSS 8.8). None of these CVEs is in CISA KEV or linked to ransomware, so this is a scheduled patch rather than an emergency, but Exchange servers are mail-facing and a nine-CVE batch at CVSS 8.8 is worth moving on promptly. Anyone running Exchange SE RTM, especially servers reachable from the internet, is exposed until it is installed.
Do this: Install KB5133453 on your Exchange SE RTM servers in your next maintenance window, starting with internet-facing servers, and verify the build number afterward.
AI-generated from public data, 2026-11-10. Verify against the vendor advisory before acting.
Senserva AI Opinion and rich prompt for KB5133453
Copy this prompt into Claude, ChatGPT, or Copilot. The facts are included, sourced from this page.
Full tracking and change history for KB5133453
- Released
- 2026-11-10
- Last changed
- 2026-11-10
- 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 KB5133453 is installed
This update is for Microsoft Exchange Server Subscription Edition RTM, not a Windows component, so Get-HotFix does not list it. Compare the installed version of the product with the build Microsoft lists for this update.
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.
| CVE | Severity | CVSS | EPSS | Exploited |
|---|---|---|---|---|
| CVE-2026-118149 | High | 8.8 | - | No |
| CVE-2026-118150 | High | 8.8 | - | No |
| CVE-2026-118154 | High | 8.8 | - | No |
| CVE-2026-118207 | High | 8.8 | - | No |
| CVE-2026-118153 | High | 7.5 | - | No |
| CVE-2026-118151 | High | 7.2 | - | No |
| CVE-2026-118157 | High | 7.2 | - | No |
| CVE-2026-118208 | High | 7.1 | - | No |
| CVE-2026-118152 | Medium | 6.5 | - | No |
Scope and sources
- Affected products
- Also released in November 2026
KB5002945
24 CVEs · CriticalKB5129299
57 CVEs · CriticalKB5129300
54 CVEs · CriticalKB5131077
625 CVEs · CriticalKB5131080
627 CVEs · CriticalKB5131085
575 CVEs · CriticalKB5131087
574 CVEs · CriticalKB5131090
592 CVEs · CriticalThe full month, summarized: Microsoft Patch Tuesday.
- Authoritative references
See this and every Microsoft update ranked by real-world risk on the Microsoft Patch Tracker.