EUVD-2026-56766
GHSA-4pg5-gw5q-8554
Severity by source
AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Network vector confirmed by description; PR:L reflects required authenticated access; S:U because privilege escalation stays within SharePoint system boundary.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
Lifecycle Timeline
3DescriptionCVE.org
Server-side request forgery (ssrf) in Microsoft Office SharePoint allows an authorized attacker to elevate privileges over a network.
AnalysisAI
Privilege escalation via SSRF in Microsoft Office SharePoint exposes authenticated users to full system compromise - confidentiality, integrity, and availability all rated High. The CVSS vector (PR:L/AV:N/AC:L/UI:N) confirms that any authenticated SharePoint user can trigger the vulnerability over the network without additional complexity. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires the attacker to hold at least low-level authenticated access to the SharePoint environment (PR:L per CVSS vector), confirming this is not an unauthenticated attack path. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 8.8 score is driven by network-accessible exploitation (AV:N), low complexity (AC:L), low privilege requirement (PR:L), no user interaction (UI:N), and high impact across all three pillars (C:H/I:H/A:H). … 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 | The primary remediation is to apply the patch issued by Microsoft via the MSRC advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-70326. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, conduct a complete inventory of all Microsoft SharePoint instances across the organization and document all users with authentication privileges to identify exposure scope. …
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Same weakness CWE-918 – Server-Side Request Forgery (SSRF)
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External POC / Exploit Code
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