CVE-2025-53786
highpriority · track · 13EPSS 0.076 · 95 %ileexploit · PoCDEEUNLRUUSEPSS · scored 2026-10-27
On April 18th 2025, Microsoft announced Exchange Server Security Changes for Hybrid Deployments and accompanying non-security Hot Fix. Microsoft made these changes in the general interest of improving the security of hybrid Exchange deployments. Following further investigation, Microsoft identified specific security implications tied to the guidance and configuration steps outlined in the April announcement. Microsoft is issuing CVE-2025-53786 to document a vulnerability that is addressed by taking the steps documented with the April 18th announcement. Microsoft strongly recommends reading the information, installing the April 2025 (or later) Hot Fix and implementing the changes in your Exchange Server and hybrid environment.
remediations
Vendor fix, mitigation, or workaround guidance, as published by each source.
A vendor fix is available.
- FixedMicrosoft Exchange Server 2016 Cumulative Update 23msrc_csaf
15.01.2507.055:Security Update:http://support.microsoft.com/kb/KB5050674
http://support.microsoft.com/kb/KB5050674 - FixedMicrosoft Exchange Server 2019 Cumulative Update 14msrc_csaf
15.02.1544.025:Security Update:http://support.microsoft.com/kb/KB5050673
http://support.microsoft.com/kb/KB5050673 - FixedMicrosoft Exchange Server 2019 Cumulative Update 15msrc_csaf
15.02.1748.024:Security Update:http://support.microsoft.com/kb/KB5050672
http://support.microsoft.com/kb/KB5050672 - FixedMicrosoft Exchange Server Subscription Edition RTMmsrc_csaf
15.02.2562.017:Security Update:http://support.microsoft.com/kb/5047155
http://support.microsoft.com/kb/5047155
cvss
Technical severity, 0–10. One row per scoring source.
base score 0–10 · higher = more severe · hover a vector to decode
ssvc
A stakeholder decision — act, attend, or track — from exploitation and impact.
weaknesses
The CWE weakness classes this flaw belongs to.
exploits (1)
Public proof-of-concept and weaponised exploit code.
- vincentdthe/CVE-2025-53786vincentdthe/CVE-2025-53786PoC · poc_in_github
affected products (31)
Products and version ranges known to be affected.
- Microsoft Exchange Server 2016 Cumulative Update 23all versionscert_bundDEcpe:/a:microsoft:exchange_server_2016:cumulative_update_23
- Microsoft Exchange Server 2019 Cumulative Update 14all versionscert_bundDEcpe:/a:microsoft:exchange_server_2019:cumulative_update_14
- Microsoft Exchange Server 2019 Cumulative Update 15all versionscert_bundDEcpe:/a:microsoft:exchange_server_2019:cumulative_update_15
- Microsoft Exchange Server Subscription Edition RTMall versionscert_bundDEcpe:/a:microsoft:exchange:server
advisories (5)
Vendor and ecosystem advisories describing this.
- NCSC-2025-0243Kwetsbaarheid verholpen in Microsoft ExchangeNL2025-08-07csaf · ncsc_nlNL
Microsoft heeft een kwetsbaarheid verholpen in Microsoft Exchange Server (hybride implementaties).
- NCSC-2025-0252Kwetsbaarheden verholpen in Microsoft Exchange ServerNL2025-08-13csaf · ncsc_nlNL
Microsoft heeft kwetsbaarheden verholpen in Microsoft Exchange Server.
- WID-SEC-W-2025-1742Microsoft Exchange Server: Schwachstelle ermöglicht PrivilegieneskalationDeutsch2025-08-06csaf · cert_bundDE
Ein entfernter, authentisierter Angreifer kann eine Schwachstelle in Microsoft Exchange Server ausnutzen, um seine Privilegien zu erhöhen.
- WID-SEC-W-2025-1781Microsoft Exchange Server und Microsoft Exchange: Mehrere SchwachstellenDeutsch2025-08-12csaf · cert_bundDE
Ein Angreifer kann mehrere Schwachstellen in Microsoft Exchange Server und Microsoft Exchange ausnutzen, um seine Privilegien zu erhöhen, um Daten zu Manipulieren, und um Informationen offenzulegen.
- msrc_CVE-2025-53786Microsoft Exchange Server Hybrid Deployment Elevation of Privilege Vulnerability2025-08-12csaf · msrc_csafUS
To determine the support lifecycle for your software, see the Microsoft Support Lifecycle: https://support.microsoft.com/lifecycle
also known as (4)
Other names and identifiers for this entity.
sources
Which sources assert this record, and when.
references (5)
External citations — patches, advisories, analysis.
- https://access.redhat.com/security/cve/cve-2025-53786cnnvd
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-53786cnnvd
- https://vigilance.fr/vulnerability/Microsoft-Exchange-Server-Hybrid-Deployment-privilege-escalation-dated-06-08-2025-47871cnnvd
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-53786enisa_euvd
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-53786Vendor Advisorynvd
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