Vulnerability details
CVE-2026-45503
Microsoft Exchange Server
Microsoft Exchange Server Information Disclosure Vulnerability
CVSS 3.1
8.1High
Official description
Improper authorization in Microsoft Exchange Server allows an authorized attacker to disclose information over a network.
CVSS scores
| Score | Version | Source | Vector |
|---|---|---|---|
| 8.1High | 3.1 | CVEProject cvelistV5 (CNA) (microsoft) | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N/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 < 15.01.2507.071 | CVEProject cvelistV5 (CNA) |
| Microsoft | Microsoft Exchange Server 2019 Cumulative Update 14 | 15.02.0.0 ≤ v < 15.02.1544.043 | CVEProject cvelistV5 (CNA) |
| Microsoft | Microsoft Exchange Server 2019 Cumulative Update 15 | 15.02.0.0 ≤ v < 15.02.1748.048 | CVEProject cvelistV5 (CNA) |
| Microsoft | Microsoft Exchange Server Subscription Edition RTM | 15.02.0.0 ≤ v < 15.02.2562.045 | CVEProject cvelistV5 (CNA) |
References and advisories
1- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-45503 vendor-advisorypatch
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Details
- Published
- 2026-06-09
- Last updated
- 2026-09-24
- State
- Published
- Assigner (CNA)
- microsoft
Exploit prediction (EPSS)
0.44%
Probability of exploitation in 30 days
38.8%
Percentile (among all CVEs)
SSVC assessment (CISA)
- Automatable
- No
- Exploitation
- None
- Technical impact
- Total
Weaknesses (CWE)
- CWE-285Improper Authorization