EUVD-2026-56776
GHSA-59w3-vwvr-9367
Severity by source
AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Network vector and low complexity consistent with passive credential interception; PR:L required per authenticated spoofing premise; high confidentiality for credential capture; no integrity or availability impact per description.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
Lifecycle Timeline
3DescriptionCVE.org
Insufficiently protected credentials in Microsoft Office SharePoint allows an authorized attacker to perform spoofing over a network.
AnalysisAI
Credential exposure in Microsoft SharePoint Server (CWE-522) enables an authenticated network attacker to intercept insufficiently protected credentials and perform identity spoofing against the affected deployment. All three active on-premises SharePoint release lines are confirmed affected - 2016 Enterprise, 2019, and Subscription Edition - with patched thresholds provided by EUVD. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires the attacker to hold a valid, low-privilege SharePoint account (PR:L confirmed by CVSS vector) and to have network-layer access to traffic between SharePoint clients and the target server - a passive interception position on the network path. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 base score of 6.5 (Medium) is consistent with the vector AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N - network-accessible, low complexity, authenticated (PR:L), with high confidentiality impact but no integrity or availability consequence. … 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 Microsoft's vendor-released patches immediately: upgrade SharePoint Enterprise Server 2016 to version 16.0.5565.1001 or later, SharePoint Server 2019 to version 16.0.10417.20198 or later, and SharePoint Server Subscription Edition to version 16.0.19725.20522 or later. … Detailed patch versions, workarounds, and compensating controls in full report. |
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Same weakness CWE-522 – Insufficiently Protected Credentials
View allSame technique Information Disclosure
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External POC / Exploit Code
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