EUVD-2026-73288
GHSA-6xhj-vjvv-j35f
Severity by source
AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Network-accessible SharePoint endpoint reachable by any authenticated low-privilege user; low complexity and full C/I/A impact consistent with server-side code execution via access control failure.
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 allows any low-privileged authenticated user to execute arbitrary code on the server over the network via an improper access control flaw (CWE-284). The vulnerability carries a CVSS 8.8 with full C:H/I:H/A:H impact triad, meaning successful exploitation yields complete compromise of the SharePoint server. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires a valid low-privilege account on the targeted SharePoint Server Subscription Edition instance, consistent with CVSS PR:L and the description's explicit 'authorized attacker' qualification - any standard authenticated SharePoint user (e.g., site contributor or read-level member) satisfies this prerequisite. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 8.8 vector (AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H) signals a high-priority, low-friction attack: any authenticated SharePoint user can achieve full server compromise with a crafted network request and no additional preconditions. … 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 | Upgrade Microsoft SharePoint Server Subscription Edition to version 16.0.20326.20082 or later via the Microsoft Security Response Center update at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-69273. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: Identify all on-premises SharePoint Server Subscription Edition instances in production and non-production environments; audit which users hold low-privileged authenticated access to each instance. …
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Same weakness CWE-284 – Improper Access Control
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External POC / Exploit Code
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