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CVE-2026-20963 is a critical remote code execution vulnerability in Microsoft Office SharePoint caused by deserialization of untrusted data. The flaw affects on-premises SharePoint deployments, including SharePoint Enterprise Server 2016, SharePoint Server 2019, and SharePoint Server Subscription Edition; older unsupported SharePoint Server 2007, 2010, and 2013 versions are also reported vulnerable. Successful exploitation allows a remote attacker to send crafted data to a vulnerable SharePoint server and trigger unsafe deserialization, resulting in arbitrary code execution in a low-complexity network attack. Multiple reports characterize the issue as exploitable without authentication and without user interaction, and the vulnerability was added to CISA’s Known Exploited Vulnerabilities catalog in March 2026 after in-the-wild exploitation was confirmed.
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What an attacker gets, and what they’ve been doing with it.
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No valid public exploits. Mallory filtered out 1 candidate as fakes, detection scripts, or README-only repos.
All candidate exploits were filtered out by Mallory's validation.
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.
81 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A specific vulnerability listed among the report's analyzed CVEs, but without further detail in the content.
A Microsoft Office SharePoint deserialization vulnerability enabling network code execution by an authorized attacker, mentioned as prior background and noted as added to CISA KEV.
Unauthenticated remote code execution vulnerability in SharePoint discussed as a comparison point to CVE-2026-45659. The content describes it as automatable, high-risk, and already undergoing mass scanning.
A Microsoft SharePoint unauthenticated remote code execution vulnerability from January 2026 that was confirmed exploited in the wild.
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.