Deserialization of untrusted data in Microsoft Office SharePoint allows an authorized attacker to execute code over a network.
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Score 8.8 from GitHub Security Advisory (severity: HIGH) published 2026-05-12. NVD baseline CVSS 8.8; sources differ by 0.0.
Deserialization of untrusted data in Microsoft Office SharePoint allows an authorized attacker to execute code over a network.
May 12, 2026
May 26, 2026
Security Update Guide - Microsoft Security Response Center. Patch available via Microsoft Security Update
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-40357These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.
MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.
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msrc
CWE-502