EUVD-2026-73643
GHSA-x5mf-hm8f-322c
Severity by source
AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
Network-delivered credential capture requires only user document-open interaction; no attacker privileges needed; confidentiality-only impact as no write or denial-of-service capability is described.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
Lifecycle Timeline
3DescriptionCVE.org
Insufficiently protected credentials in Microsoft Office allows an unauthorized attacker to perform spoofing over a network.
AnalysisAI
Insufficiently protected credential transmission in Microsoft Office exposes NTLM or equivalent credential material to a network-adjacent attacker via a crafted document or resource link. Affected versions span the entire active Office portfolio - Office 2016 through LTSC 2024 and Microsoft 365 Apps for Enterprise - making the exposure broadly relevant. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | The victim must open a specially crafted Office document or follow a resource link that triggers an outbound network authentication handshake - this is the user interaction (UI:R) reflected in the CVSS vector. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 6.5 score reflects the UI:R requirement, which lowers the overall score from what would otherwise be a higher-impact credential exposure; however, phishing and malicious document delivery are standard attacker techniques that reduce the effective barrier significantly. … 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-released security update immediately. … Detailed patch versions, workarounds, and compensating controls in full report. |
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Same weakness CWE-522 – Insufficiently Protected Credentials
View allSame technique Authentication Bypass
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External POC / Exploit Code
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