EUVD-2026-56722
GHSA-92r3-28gr-fr7w
Severity by source
AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Network vector and low complexity confirmed; PR:L upheld because initial authenticated access is required before invoking the unprotected function.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
Lifecycle Timeline
3DescriptionCVE.org
Missing authentication for critical function in Microsoft Office SharePoint allows an authorized attacker to elevate privileges over a network.
AnalysisAI
Privilege escalation in Microsoft SharePoint Server (2016 Enterprise, 2019, and Subscription Edition) allows a low-privileged authenticated attacker to gain elevated access over the network by invoking a critical internal function that lacks proper authentication enforcement. The flaw (CWE-306) is exploitable with low complexity and no user interaction, resulting in full confidentiality, integrity, and availability impact. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | The attacker must possess a valid SharePoint account with at least low-privilege access (PR:L per CVSS vector) - anonymous or unauthenticated exploitation is not possible. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 8.8 (High) score is well-supported by the attack characteristics: network-accessible (AV:N), low complexity (AC:L), low privilege requirement (PR:L), no user interaction (UI:N), and full impact across all three CIA pillars. … 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 vendor-released patches immediately: upgrade SharePoint Server Subscription Edition to 16.0.19725.20522 or later, SharePoint Enterprise Server 2016 to 16.0.5565.1001 or later, and SharePoint Server 2019 to 16.0.10417.20198 or later. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, conduct a complete inventory of all Microsoft SharePoint Server deployments and document which are running versions 2016 Enterprise, 2019, or Subscription Edition. …
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Same technique Authentication Bypass
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External POC / Exploit Code
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