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CVE-2026-33110 is a remote code execution vulnerability in on-premises Microsoft SharePoint Server caused by deserialization of untrusted data. SharePoint improperly processes attacker-controlled serialized input, allowing an authenticated attacker to trigger code execution on the server over the network. Public reporting indicates exploitation requires only low privileges, such as basic Site Member permissions, and no user interaction. The issue affects supported on-premises SharePoint Enterprise Server 2016, SharePoint Server 2019, and SharePoint Server Subscription Edition builds prior to the patched releases. Microsoft has not publicly identified the exact vulnerable component or function.
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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.
8 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 related Microsoft SharePoint Server remote code execution vulnerability included in the same May 2026 patch cycle.
Another SharePoint-related CVE mentioned only as part of the cumulative May 2026 update bundle; no technical details are provided in the content.
A SharePoint Server deserialization vulnerability that allows authenticated remote code execution by a user with Site Member permissions.
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.