Advisoriesby IbisMicrosoftCVE-2026-58644
Microsoft Office SharePoint: unsafe deserialization
Fix: upgrade to 16.0.5556.1005 or later (3 fixed versions below)
Deserialization of untrusted data in Microsoft Office SharePoint allows an unauthorized attacker to execute code over a network.
Affected versions
| Package | Affected | Fixed in |
|---|---|---|
| Microsoft SharePoint Enterprise Server 2016 Product | >= 16.0.0, < 16.0.5556.1005 | 16.0.5556.1005 |
| Microsoft SharePoint Server 2019 Product | >= 16.0.0, < 16.0.10417.20153 | 16.0.10417.20153 |
| Microsoft SharePoint Server Subscription Edition Product | >= 16.0.0, < 16.0.19725.20384 | 16.0.19725.20384 |
Details and references
- CVSS 3.1
- CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- Severity from
- the vendor (its own CVE record or advisory)
- Weakness
- CWE-502