EUVD-2026-73129
GHSA-x6mm-qwwf-pcg3
Severity by source
AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
Network-accessible Exchange service, low complexity, requires authenticated account (PR:L); high C and I reflect full Exchange data/config access; no availability impact described.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
Lifecycle Timeline
4DescriptionCVE.org
Missing authorization in Microsoft Exchange Server allows an authorized attacker to elevate privileges over a network.
AnalysisAI
Privilege escalation in Microsoft Exchange Server (2016 CU23, 2019 CU14/CU15, and Subscription Edition) stems from missing authorization checks (CWE-862) on one or more network-accessible operations, enabling authenticated low-privileged users to gain high-impact read and write access beyond their assigned roles. All major in-support Exchange branches are affected across specific build ranges. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires possession of at least one valid, low-privileged Exchange account within the target organization (CVSS PR:L). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 8.1 vector (AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N) indicates that any valid Exchange account holder can trigger this over the network with no interaction required and no special configuration prerequisites, yielding high confidentiality and integrity impact against Exchange data and configuration. … 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 | Patch available per vendor advisory. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, inventory all Microsoft Exchange servers in your environment and identify which systems run affected versions (2016 CU23, 2019 CU14/CU15, or Subscription Edition); assess whether any are internet-facing and document current user populations with administrative or high-privilege roles. …
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Same weakness CWE-862 – Missing Authorization
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External POC / Exploit Code
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