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Public proof of conceptFix available

CVE-2025-53786

A public proof of concept exists; no exploitation attested.

  • Published2025-08-06
  • WeaknessCWE-287

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

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.

Timeline

dates in UTC
  1. 2025-08-0616:15CVE publishedNVD

Versions per branch

NVD
Microsoft Exchange Server
BranchAffectedFixed in
2016.x= 2016no fix published
2019.x= 2019no fix published
Microsoft exchange server subscription edition
BranchAffectedFixed in
15.2< 15.02.2562.01715.02.2562.017

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Products declared by the CNA4 products

As microsoft, the CNA that assigned this CVE, declared them in the CVE record; versions as written.

  • Microsoft Exchange Server 2016 Cumulative Update 23

    platforms: x64-based Systems

    Affected
    • ≥ 15.01.0.0, < 15.01.2507.055fixed in 15.01.2507.055custom
  • Microsoft Exchange Server 2019 Cumulative Update 14

    platforms: x64-based Systems

    Affected
    • ≥ 15.02.0.0, < 15.02.1544.025fixed in 15.02.1544.025custom
  • Microsoft Exchange Server 2019 Cumulative Update 15

    platforms: x64-based Systems

    Affected
    • ≥ 15.02.0.0, < 15.02.1748.024fixed in 15.02.1748.024custom
  • Microsoft Exchange Server Subscription Edition RTM

    platforms: x64-based Systems

    Affected
    • ≥ 15.02.0.0, < 15.02.2562.017fixed in 15.02.2562.017custom

Source: the CNA record (CVE Program), © The MITRE Corporation,CVE Terms of UseCVE recordupdated 2026-02-13

Fix

Advisories and patches

Detection

read 2026-11-01 01:02 UTC
Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof of concept
Metasploit modules
none listed
Metasploit Framework

Sources

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H
Published
2025-08-06
Last Modified
2026-06-17
NVD status
Analyzed
GitHub Advisory
GHSA-v92c-556h-xm93

Frequently asked questions

What is CVE-2025-53786?

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.

Is CVE-2025-53786 actively exploited?

Active exploitation of CVE-2025-53786 has not been confirmed. Its EPSS score was 8.0% on 2026-11-08, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2025-53786?

CVE-2025-53786 has a CVSS v3 base score of 8 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H.

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