CVE-2026-85900
Microsoft Sharepoint Server: unsafe deserialisation
- Risk score
- 78/100
- CVSS
- 8.8 v3.1
- Exploit chance (30 days)
- 1.5%
- Published
- 13 Oct 2026
Open in the live forecast Today's forecast
What to know
- What it is
- Deserialization of untrusted data in Microsoft Office SharePoint allows an authorized attacker to execute code over a network.
- Affected
- Microsoft Sharepoint Server
- Fix
- Apply the vendor's security update; see the linked advisory.
- Exploitation
- No known exploitation
Story map
At a glance
Microsoft Sharepoint Server: Amber, patch this week. Deserialization of untrusted data in Microsoft Office SharePoint allows an authorized attacker to execute code over a network.
The flaws
- CVE-2026-85900: Unsafe deserialisation (CVSS 8.8 · EPSS 2%)
- CVE-2026-69943: Path traversal (CVSS 8.8 · EPSS 1%)
- CVE-2026-70266: SQL injection (CVSS 8.8 · EPSS 1%)
- CVE-2026-102863: Code injection (CVSS 8.8 · EPSS 1%)
The fix
Fix: Apply the vendor's security update; see the linked advisory.
Who is exposed: Microsoft Sharepoint Server
Where it stands
- No known exploitation
Connects to
- Same weakness: Unsafe deserialisation (CWE-502). 250 other warnings in 30 days
- Same product: Earlier Microsoft Sharepoint Server warnings. 33 in the last 90 days
Why it is Amber
- CVSS 8.8 high
- On your watchlist: sharepoint
References
Original description
Deserialization of untrusted data in Microsoft Office SharePoint allows an authorized attacker to execute code over a network.
Last activity 13 Oct 2026. Patch Forecast updates every hour.