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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 target server over the network. Publicly available information identifies the issue as affecting SharePoint Enterprise Server 2016, SharePoint Server 2019, and SharePoint Server Subscription Edition prior to the patched builds released in May 2026. The specific vulnerable component or function has not been publicly disclosed.
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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.
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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.
10 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.