Microsoft SharePoint Server Remote Code Execution Vulnerability
CVE-2026-40365 is a critical remote code execution vulnerability in Microsoft SharePoint Server caused by insufficient granularity of access control. The flaw allows an authenticated attacker to send crafted network requests to a vulnerable SharePoint server and execute arbitrary code on the server. Multiple supporting sources describe the issue as an access-control weakness in SharePoint Server, and several specifically note that exploitation is possible for an authenticated user with at least Site Owner privileges. Microsoft’s advisory summary further states that successful exploitation allows the attacker to write arbitrary code and achieve remote code execution on the SharePoint Server.
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Impact, mitigation & remediation
What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
Impact
What an attacker gets, and what they’ve been doing with it.
Mitigation
If you can’t patch tonight, do this now.
Remediation
Patch, then assume compromise.
Exploits
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
Affected products & vendors
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.
Recent activity
7 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
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.
A remote code execution vulnerability in Microsoft SharePoint Server that allows authenticated attackers with Site Owner privileges to execute arbitrary code.
The version that knows your environment.
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.