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CVE-2026-40365 is a critical remote code execution vulnerability in on-premises Microsoft SharePoint Server caused by insufficient granularity of access control. The flaw allows an authenticated attacker to send crafted requests to a vulnerable SharePoint server and execute arbitrary code over the network. Available reporting consistently describes exploitation as post-authentication and indicates that attackers with at least Site Owner privileges can trigger code execution on the underlying SharePoint server. The issue was addressed by Microsoft in the May 2026 security updates for SharePoint Server Subscription Edition, SharePoint Server 2019, and SharePoint Enterprise Server 2016.
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What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
What an attacker gets, and what they’ve been doing with it.
If you can’t patch tonight, do this now.
Patch, then assume compromise.
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
16 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A May 2026 Microsoft SharePoint remote code execution vulnerability referenced for comparison with CVE-2026-47294.
A remote code execution vulnerability in Microsoft SharePoint Server that allows an authenticated attacker to send crafted requests and execute code remotely.
A remote code execution vulnerability affecting Microsoft SharePoint Server that can be exploited by an authenticated attacker over the network.
An access-control vulnerability in Microsoft SharePoint Server that allows authenticated users to execute code on the server.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.