EUVD-2026-73286
GHSA-c89w-v968-mp6c
Severity by source
AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Network-reachable, low complexity, low-privilege account required; code execution yields full C/I/A impact; scope unchanged as exploitation is confined to the SharePoint host.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
Lifecycle Timeline
4DescriptionCVE.org
Improper access control in Microsoft Office SharePoint allows an authorized attacker to execute code over a network.
AnalysisAI
Remote code execution in Microsoft SharePoint Server Subscription Edition (below 16.0.20326.20090) allows a low-privileged authenticated attacker to execute arbitrary code over the network by exploiting improper access control. The flaw, rooted in CWE-284, permits an authorized user to exceed their intended permissions and trigger server-side code execution without any user interaction. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | The attacker must hold a valid SharePoint user account with at least low-level privileges (PR:L per CVSS). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 8.8 score is well-supported by the vector (AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H): network-accessible, low complexity, requiring only a valid SharePoint user account with no interaction needed from other users. … 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 patch upgrading Microsoft SharePoint Server Subscription Edition to version 16.0.20326.20090 or later, as detailed in the Microsoft Security Response Center advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-69268. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: inventory all SharePoint Server Subscription Edition deployments and identify systems running versions below 16.0.20326.20090; notify infrastructure and security teams of the RCE risk tied to any authenticated user access. …
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Same weakness CWE-284 – Improper Access Control
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External POC / Exploit Code
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