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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 deserializes attacker-controlled serialized input without sufficient validation, allowing a low-privileged authenticated user to supply a malicious serialized object that triggers arbitrary code execution when processed by the vulnerable server-side component. Microsoft classified the issue as Important and described exploitation as possible over the network with low attack complexity and no user interaction. Affected products include SharePoint Server Subscription Edition before build 16.0.19725.20280, SharePoint Server 2019 before build 16.0.10417.20128, and SharePoint Enterprise Server 2016 before build 16.0.5552.1002.
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What an attacker gets, and what they’ve been doing with it.
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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.
16 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.