CVEs / CVE-2026-45502
CVE-2026-45502: Microsoft Microsoft Exchange Server 2016 Cumulative Update 23 vulnerability
- medium 5 CVSS 3.1 (from the CNA)
- EPSS 20.2% chance of exploitation in the next 30 days, higher than 97% of CVEs (30 Oct 2026)
- Last changed at its sources
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Description
Server-side request forgery (ssrf) in Microsoft Exchange Server allows an authorized attacker to disclose information over a network.
Affected and fixed versions
| Product | Affected | Fixed in |
|---|---|---|
| Microsoft Microsoft Exchange Server 2016 Cumulative Update 23 | from 15.01.0.0, before 15.01.2507.071 | 15.01.2507.071 |
| Microsoft Microsoft Exchange Server 2019 Cumulative Update 14 | from 15.02.0.0, before 15.02.1544.043 | 15.02.1544.043 |
| Microsoft Microsoft Exchange Server 2019 Cumulative Update 15 | from 15.02.0.0, before 15.02.1748.048 | 15.02.1748.048 |
| Microsoft Microsoft Exchange Server Subscription Edition RTM | from 15.02.0.0, before 15.02.2562.045 | 15.02.2562.045 |
Exploitation
Not in the CISA Known Exploited Vulnerabilities catalog as of 30 Oct 2026.
Severity
| CVSS 3.1 | 5 mediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:N/A:NScored by the CNA ([email protected]) |
|---|---|
| Weakness | CWE-918 |
References
- CVE-2026-45502 on NVD
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-45502 Vendor Advisory
Sources
Exploitation status from the CISA Known Exploited Vulnerabilities catalog. EPSS scores from FIRST. Descriptions, severity and references from the National Vulnerability Database. Open-source package versions from OSV (CC-BY 4.0). Text is shown as each source states it; Stackurity does not edit it. Check the vendor's advisory before acting.
This product uses data from the NVD API but is not endorsed or certified by the NVD.