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CVE-2026-50522 is a critical deserialization of untrusted data vulnerability in Microsoft Office SharePoint. The flaw affects Microsoft SharePoint Enterprise Server 2016, SharePoint Server 2019, and SharePoint Server Subscription Edition on x64-based systems prior to the fixed builds. A remote, unauthorized attacker can reach the vulnerable functionality over the network without authentication or user interaction and trigger unsafe deserialization, resulting in arbitrary code execution in the SharePoint server context. The vulnerability has been described as part of a critical pair of SharePoint remote code execution issues and a working exploit was demonstrated at Pwn2Own Berlin.
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No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
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A Microsoft SharePoint remote code execution vulnerability mentioned as being fixed by the July 2026 security updates.
A critical SharePoint Server remote code execution vulnerability caused by deserialization of untrusted data; it is unauthenticated and requires no user interaction. The content states a working exploit was demonstrated publicly.
A critical unauthenticated SharePoint remote code execution vulnerability caused by deserialization of untrusted data. It is notable because a working exploit was demonstrated at Pwn2Own Berlin.
A critical SharePoint Server remote code execution vulnerability mentioned as part of the broader Patch Tuesday release.
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.