CVE-2026-45504: CWE-918: Server-Side Request Forgery (SSRF) in Microsoft Microsoft Exchange Server 2016 Cumulative Update 23
Server-side request forgery (ssrf) in Microsoft Exchange Server allows an authorized attacker to elevate privileges over a network.
AI Analysis
Technical Summary
This vulnerability, identified as CVE-2026-45504 and classified under CWE-918, affects Microsoft Exchange Server 2016 Cumulative Update 23 (version 15.01.0.0). It is a server-side request forgery flaw that enables an authorized attacker to perform privilege escalation over a network. The CVSS 3.1 base score is 8.8, indicating high impact on confidentiality, integrity, and availability. Microsoft has released an official fix for this issue as documented in their security update guide.
Potential Impact
An authorized attacker exploiting this SSRF vulnerability can elevate their privileges within the network environment where the affected Exchange Server is deployed. This could lead to unauthorized access to sensitive information, modification of data, or disruption of service. The high CVSS score reflects the critical nature of the impact on confidentiality, integrity, and availability.
Mitigation Recommendations
Microsoft has released an official fix for this vulnerability. It is recommended to apply the security update provided by Microsoft for Exchange Server 2016 Cumulative Update 23 as soon as possible. No additional mitigation steps are indicated beyond applying the official patch.
CVE-2026-45504: CWE-918: Server-Side Request Forgery (SSRF) in Microsoft Microsoft Exchange Server 2016 Cumulative Update 23
Description
Server-side request forgery (ssrf) in Microsoft Exchange Server allows an authorized attacker to elevate privileges over a network.
CVSS v3.1
Score 8.8high
Affected software
Microsoft
Microsoft Exchange Server 2016 Cumulative Update 23
Microsoft
Microsoft Exchange Server 2019 Cumulative Update 14
Microsoft
Microsoft Exchange Server 2019 Cumulative Update 15
Microsoft
Microsoft Exchange Server Subscription Edition RTM
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability, identified as CVE-2026-45504 and classified under CWE-918, affects Microsoft Exchange Server 2016 Cumulative Update 23 (version 15.01.0.0). It is a server-side request forgery flaw that enables an authorized attacker to perform privilege escalation over a network. The CVSS 3.1 base score is 8.8, indicating high impact on confidentiality, integrity, and availability. Microsoft has released an official fix for this issue as documented in their security update guide.
Potential Impact
An authorized attacker exploiting this SSRF vulnerability can elevate their privileges within the network environment where the affected Exchange Server is deployed. This could lead to unauthorized access to sensitive information, modification of data, or disruption of service. The high CVSS score reflects the critical nature of the impact on confidentiality, integrity, and availability.
Mitigation Recommendations
Microsoft has released an official fix for this vulnerability. It is recommended to apply the security update provided by Microsoft for Exchange Server 2016 Cumulative Update 23 as soon as possible. No additional mitigation steps are indicated beyond applying the official patch.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- microsoft
- Date Reserved
- 2026-05-12T16:07:22.619Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- official-fix
- Vendor Advisory Urls
- [{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-45504","vendor":"Microsoft"}]
Threat ID: 6a284cdf8dd33fbd85664dac
Added to database: 06/09/2026, 17:26:55 UTC
Last enriched: 08/14/2026, 13:38:19 UTC
Last updated: 09/12/2026, 22:01:34 UTC
Views: 221
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