EUVD-2026-73146
GHSA-wvx2-g3w5-c329
Severity by source
AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
Network-reachable, low-complexity elevation of privilege requiring an existing privileged account (PR:H), no user interaction, with scope change and full CIA impact consistent with Exchange/AD integration.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
Lifecycle Timeline
3DescriptionCVE.org
Missing authorization in Microsoft Exchange Server allows an authorized attacker to elevate privileges over a network.
AnalysisAI
Network-based privilege escalation in Microsoft Exchange Server lets an already-authenticated attacker gain higher privileges by exploiting a missing authorization check (CWE-862). Affected on-premises builds include Exchange 2016 CU23, Exchange 2019 CU14/CU15, and the Subscription Edition; Microsoft has released fixed cumulative-update builds via MSRC. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires the attacker to already be an authenticated, privileged principal on the target Exchange environment (CVSS PR:H = 'authorized attacker'), reachable over the network (AV:N) with no user interaction (UI:N) and low complexity (AC:L). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 vector (AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H = 9.1 Critical) describes a low-complexity, network-reachable elevation of privilege that requires the attacker to already hold privileges (PR:H) but no user interaction, with a scope change and full confidentiality/integrity/availability impact. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Apply the Microsoft security update for your Exchange branch to at least the fixed build: 15.01.2507.073 for Exchange 2016 CU23, 15.02.1544.046 for Exchange 2019 CU14, 15.02.1748.051 for Exchange 2019 CU15, and 15.02.2562.049 for Exchange Server Subscription Edition (Vendor-released patch confirmed via MSRC: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-69641). … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, identify all Microsoft Exchange Server deployments running affected versions (2016 CU23, 2019 CU14/CU15, or Subscription Edition) and map which are internet-facing or accessible to internal users. …
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Same weakness CWE-862 – Missing Authorization
View allSame technique Authentication Bypass
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External POC / Exploit Code
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