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CVE-2026-58644 is a critical remote code execution vulnerability in Microsoft Office SharePoint caused by deserialization of untrusted data. The flaw affects on-premises SharePoint Enterprise Server 2016, SharePoint Server 2019, and SharePoint Server Subscription Edition on x64-based systems prior to the fixed builds. A specially crafted network request can cause SharePoint to deserialize attacker-controlled data without sufficient validation, leading to arbitrary code execution in the SharePoint server context. Public reporting consistently characterizes the issue as remotely reachable with low attack complexity and no user interaction, and Microsoft classifies it as a critical SharePoint RCE with CVSS v3.1 vector AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
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No public exploit code observed for this vulnerability.
9 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A critical remote code execution vulnerability in Microsoft SharePoint Server caused by insecure deserialization of untrusted data, allowing arbitrary code execution via crafted HTTP requests.
A newly disclosed Microsoft SharePoint Server vulnerability identified by Microsoft as posing potential risk if left unpatched; not yet known to be exploited according to the content.
A critical unauthenticated SharePoint remote code execution vulnerability caused by deserialization of untrusted data.
A critical remote code execution vulnerability in Microsoft SharePoint. It is significant because the content highlights it as a top patching priority for on-premises SharePoint due to the historical attractiveness of SharePoint RCEs to attackers.
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.
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Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.