VIR Vulnerability Intelligence Relay

CVE-2026-40357

high
Published 2026-05-12 · Modified 2026-05-13
CVSS v3
8.8
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CVSS v2
—
VIR risk
8.8

Description

Deserialization of untrusted data in Microsoft Office SharePoint allows an authorized attacker to execute code over a network.

Predictions

Exploit likelihood
92%
Patch ETA
—

Heuristic predictions, AS-IS, for prioritization only.

Mitigations

vendor Authored 2026-05-27

Vendor advisory: secure@microsoft.com — https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-40357

Application impact
VendorProductVersionsFixed
windows microsoftsharepoint_server{"endExcluding":"16.0.19725.20280"}16.0.19725.20280
windows microsoftsharepoint_server2016
windows microsoftsharepoint_server2019

References

CWEs

CWE-502

Verify integrity in audit chain (admin only). AS-IS.