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CVE-2026-33112 is an authenticated remote code execution vulnerability in on-premises Microsoft SharePoint Server caused by deserialization of untrusted data. SharePoint improperly processes attacker-controlled serialized input without sufficient validation, allowing a low-privileged authenticated user to submit a crafted payload that is deserialized by the server and results in arbitrary code execution in the context of the SharePoint application process. Microsoft rated the issue Important with CVSS 3.1 8.8. Affected products include SharePoint Server Subscription Edition, SharePoint Server 2019, and SharePoint Enterprise Server 2016 prior to the fixed builds released in May 2026.
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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.
14 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 remote code execution vulnerability in Microsoft Office SharePoint caused by deserialization of untrusted data. It allows an authenticated attacker with low privileges, such as at least Site Owner access, to execute code remotely over the network.
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.