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CVE-2026-40368 is a remote code execution vulnerability in Microsoft Office SharePoint caused by deserialization of untrusted data. SharePoint improperly processes attacker-controlled serialized data, enabling code execution in a network-accessible attack path. Microsoft indicates the flaw is exploitable by an authenticated attacker with low privileges and that exploitation requires user interaction, specifically a client connecting to a malicious server. The issue affects supported on-premises SharePoint releases addressed in the May 2026 security updates, including SharePoint Server Subscription Edition, SharePoint Server 2019, and SharePoint Server 2016/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.
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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.
7 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A SharePoint-related CVE mentioned only as another issue covered by the same cumulative update.
Another SharePoint-related CVE mentioned only as part of the cumulative May 2026 update bundle; no technical details are provided in the content.
A remote code execution vulnerability in Microsoft SharePoint caused by deserialization of untrusted data. It allows an authenticated attacker with low privileges to execute code over the network and requires user interaction.
A Microsoft SharePoint Server remote code execution vulnerability addressed by this security update.
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.