Vulnerability details
CVE-2026-77910
Microsoft Exchange Server
Microsoft Exchange Server Elevation of Privilege Vulnerability
CVSS 3.1
8.8High
Official description
Incorrect authorization in Microsoft Exchange Server allows an authorized attacker to elevate privileges over a network.
CVSS scores
| Score | Version | Source | Vector |
|---|---|---|---|
| 8.8High | 3.1 | CVEProject cvelistV5 (CNA) (microsoft) | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C |
Affected products
| Vendor | Product | Versions | Source |
|---|---|---|---|
| Microsoft | Microsoft Exchange Server 2016 Cumulative Update 23 | 15.01.0.0 ≤ v < 15.01.2507.077 | CVEProject cvelistV5 (CNA) |
| Microsoft | Microsoft Exchange Server 2019 Cumulative Update 14 | 15.02.0.0 ≤ v < 15.02.1544.050 | CVEProject cvelistV5 (CNA) |
| Microsoft | Microsoft Exchange Server 2019 Cumulative Update 15 | 15.02.0.0 ≤ v < 15.02.1748.055 | CVEProject cvelistV5 (CNA) |
| Microsoft | Microsoft Exchange Server Subscription Edition RTM | 15.02.0.0 ≤ v < 15.02.2562.056 | CVEProject cvelistV5 (CNA) |
References and advisories
1- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-77910 vendor-advisorypatch
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Details
- Published
- 2026-10-13
- Last updated
- 2026-10-31
- State
- Published
- Assigner (CNA)
- microsoft
Exploit prediction (EPSS)
0.86%
Probability of exploitation in 30 days
58.8%
Percentile (among all CVEs)
SSVC assessment (CISA)
- Automatable
- No
- Exploitation
- None
- Technical impact
- Total
Weaknesses (CWE)
- CWE-863Incorrect Authorization