Technology · Microsoft
Microsoft Exchange Server Subscription Edition vulnerabilities
Updated . Rebuilt every hour.
Junglewise Threat Intelligence has tracked 9 vulnerabilities in Microsoft Exchange Server Subscription Edition: 0 in the last 7 days and 3 in the last 90 days, 1 of them critical and 0 exploited in the wild. The most recent, CVE-2026-87696, was published on 13 October 2026. 3 vulnerabilities in the last four weeks, up from none in the four before.
- Last 7 days
- 0
- Last 90 days
- 3
- Critical, all time
- 1
- Exploited in the wild
- 0
About Microsoft Exchange Server Subscription Edition
A subscription-based version of the Microsoft Exchange Server email and calendaring platform.
Latest Microsoft Exchange Server Subscription Edition vulnerabilities
- CVE-2026-87696: Microsoft Exchange Server cryptographic signature verification privilege escalationhighCVSS 7.5EPSS 0.4%
- CVE-2026-87695: Microsoft Exchange Server privilege escalation via untrusted control spherehighCVSS 7.8EPSS 0.3%
- CVE-2026-87692: Microsoft Exchange Server deserialization privilege elevationhighCVSS 7.8EPSS 1.7%
- CVE-2026-62911: Microsoft Exchange Server privilege escalation via NTLM relay to MRSProxyhighCVSS 8EPSS 0.7%
- CVE-2026-55009: Microsoft Exchange Server deserialization privilege escalationhighCVSS 7.8
- CVE-2026-55008: Microsoft Exchange Server cross-site scripting spoofing vulnerabilitycriticalCVSS 9.6
- CVE-2026-55005: Microsoft Exchange Server heap overflow remote code executionhighCVSS 8.8
- CVE-2026-21527: Microsoft Exchange Server UI misrepresentation spoofing vulnerabilitymediumCVSS 6.5EPSS 9.5%
- CVE-2025-53786: Microsoft Exchange Server improper authentication in hybrid deploymentshighCVSS 8EPSS 7.4%
Most severe Microsoft Exchange Server Subscription Edition vulnerabilities
Exploited in the wild first, then by severity and CVSS score.
- CVE-2026-55008: Microsoft Exchange Server cross-site scripting spoofing vulnerabilitycriticalCVSS 9.6
- CVE-2026-55005: Microsoft Exchange Server heap overflow remote code executionhighCVSS 8.8
- CVE-2025-53786: Microsoft Exchange Server improper authentication in hybrid deploymentshighCVSS 8EPSS 7.4%
- CVE-2026-62911: Microsoft Exchange Server privilege escalation via NTLM relay to MRSProxyhighCVSS 8EPSS 0.7%
- CVE-2026-87692: Microsoft Exchange Server deserialization privilege elevationhighCVSS 7.8EPSS 1.7%
- CVE-2026-87695: Microsoft Exchange Server privilege escalation via untrusted control spherehighCVSS 7.8EPSS 0.3%
- CVE-2026-55009: Microsoft Exchange Server deserialization privilege escalationhighCVSS 7.8
- CVE-2026-87696: Microsoft Exchange Server cryptographic signature verification privilege escalationhighCVSS 7.5EPSS 0.4%
- CVE-2026-21527: Microsoft Exchange Server UI misrepresentation spoofing vulnerabilitymediumCVSS 6.5EPSS 9.5%
Vulnerabilities per week
3 vulnerabilities in the last four weeks, up from none in the four before. The last 13 weeks, by the week each vulnerability was published.
| Week of | Bar | Vulns | Critical |
|---|---|---|---|
| 17 Aug 2026 | 0 | 0 | |
| 24 Aug 2026 | 0 | 0 | |
| 31 Aug 2026 | 0 | 0 | |
| 7 Sep 2026 | 0 | 0 | |
| 14 Sep 2026 | 0 | 0 | |
| 21 Sep 2026 | 0 | 0 | |
| 28 Sep 2026 | 0 | 0 | |
| 5 Oct 2026 | 0 | 0 | |
| 12 Oct 2026 | 3 | 0 | |
| 19 Oct 2026 | 0 | 0 | |
| 26 Oct 2026 | 0 | 0 | |
| 2 Nov 2026 | 0 | 0 | |
| 9 Nov 2026 | 0 | 0 |
Embed a badge
A live badge for a README, a status page or an internal wiki: how many Microsoft Exchange Server Subscription Edition vulnerabilities were published in the last 7 days and how many of them are critical, refreshed hourly.
[](https://junglewise.ai/threats/technologies/exchange-server-subscription-edition)<a href="https://junglewise.ai/threats/technologies/exchange-server-subscription-edition"><img src="https://junglewise.ai/threats/technologies/exchange-server-subscription-edition/badge.svg" alt="Microsoft Exchange Server Subscription Edition vulnerabilities" /></a>How this is built
Junglewise Threat Intelligence collects vulnerabilities from NVD, GitHub Security Advisories, OSV, the CISA Known Exploited Vulnerabilities catalog, FIRST EPSS and vendor advisories, and matches each one to the technologies and vendors it affects. Dates are the date a vulnerability was published, in UTC.
The pages are rebuilt from the database every hour. Frozen weekly and monthly reports never change once published, so they can be cited.
Use this data
The same data is at https://junglewise.ai/threats/technologies/exchange-server-subscription-edition.json, and this page as text at https://junglewise.ai/threats/technologies/exchange-server-subscription-edition.md, for scripts and language models. It is free to reuse under CC BY 4.0 with a link back to this page.
Cite as: Junglewise Threat Intelligence, "Microsoft Exchange Server Subscription Edition vulnerabilities", https://junglewise.ai/threats/technologies/exchange-server-subscription-edition, 13 November 2026.