CVE-2026-40357
published 2026-05-12CVE-2026-40357: Deserialization of untrusted data in Microsoft Office SharePoint allows an authorized attacker to execute code over a network.
PriorityP261high8.8CVSS 3.1
AVNACLPRLUINSUCHIHAH
EPSS
1.70%
74.6th percentile
Deserialization of untrusted data in Microsoft Office SharePoint allows an authorized attacker to execute code over a network.
Affected
6 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| microsoft | microsoft_sharepoint_enterprise_server_2016 | >= 16.0.0 < 16.0.5552.1002 | 16.0.5552.1002 |
| microsoft | microsoft_sharepoint_server_2019 | >= 16.0.0 < 16.0.10417.20128 | 16.0.10417.20128 |
| microsoft | microsoft_sharepoint_server_subscription_edition | >= 16.0.0 < 16.0.19725.20280 | 16.0.19725.20280 |
| microsoft | sharepoint_server | < 16.0.19725.20280 | 16.0.19725.20280 |
| microsoft | sharepoint_server | — | — |
| microsoft | sharepoint_server | — | — |
Stop checking back — get the weekly exploitation signal.
Every Monday: what got weaponized or added to CISA KEV in the last seven days — each CVE cross-linked to its PoC, Nuclei template, and detection rule. Free, one email a week, unsubscribe in one click.
VulDB
Microsoft SharePoint Server 2.0/16.0.5548.1003 deserialization
vuldb·2026-05-12
CVE-2026-40357 [CRITICAL] Microsoft SharePoint Server 2.0/16.0.5548.1003 deserialization
A vulnerability labeled as critical has been found in Microsoft SharePoint Server 2.0/16.0.5548.1003. Impacted is an unknown function. Such manipulation leads to deserialization.
This vulnerability is referenced as CVE-2026-40357. It is possible to launch the attack remotely. No exploit is available.
The affected component should be upgraded.
GHSA
GHSA-9wcj-vxr2-vvvh: Deserialization of untrusted data in Microsoft Office SharePoint allows an authorized attacker to execute code over a network
ghsa_unreviewed·2026-05-12
CVE-2026-40357 [HIGH] CWE-502 GHSA-9wcj-vxr2-vvvh: Deserialization of untrusted data in Microsoft Office SharePoint allows an authorized attacker to execute code over a network
Deserialization of untrusted data in Microsoft Office SharePoint allows an authorized attacker to execute code over a network.
No detection rules found.
No public exploits indexed.
2026-05-12
Published