Security Resilience

CVE-2026-88206

SSRF in Microsoft Sharepoint Server ≤ 16.0.20326.20190

SSRF
Published
13 October 2026
Modified
14 October 2026
Patch / advisory
View advisory
CVSS Score v3.1 7.5
Click a component to see what it means
Raw vectorCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
EPSS Score 0.0051 42th percentile
Risk Priority 56 floored blend · peak EPSS

CVSS and EPSS are reproduced from their sources (NVD, FIRST EPSS). Risk Priority is our own derived reading, not an NVD score.

Summary

CVE-2026-88206 is a high-severity SSRF (CWE-918) vulnerability in Microsoft Sharepoint Server. Its CVSS base score is 7.5 (High).

Operationally, ranked at the 42th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.

The strongest mitigations our analysis identified map to AC-4 (Information Flow Enforcement) and SC-7 (Boundary Protection) — see the control section below for these in your framework.

OWASP Top 10 for Web (2025)

A01:2025 Broken Access Control

EU & UK References

Vulnerability Data

Server-side request forgery (ssrf) in Microsoft Office SharePoint allows an authorized attacker to elevate privileges over a network.

CWE(s)
CWE-918

Related Threats

CVEs Like This One

CVE-2025-53760Same product: Microsoft Sharepoint Server
CVE-2026-69683Same product: Microsoft Sharepoint Server
CVE-2026-70251Same product: Microsoft Sharepoint Server
CVE-2026-70326Same product: Microsoft Sharepoint Server
CVE-2024-32987Same product: Microsoft Sharepoint Server
CVE-2026-70324Same product: Microsoft Sharepoint Server
CVE-2026-55051Same product: Microsoft Sharepoint Server
CVE-2026-20958Same product: Microsoft Sharepoint Server
CVE-2026-70202Same product: Microsoft Sharepoint Server
CVE-2023-28288Same product: Microsoft Sharepoint Server

Affected Assets

microsoft
sharepoint server
≤ 16.0.20326.20190

Mitigating Controls

Control response

Prevent
Stop it (NIST 800-53)

—

Detect
Catch it (NIST detect / respond)

—

Harden
Shrink the surface (DISA STIG)

—

Validate
Prove the fix (OWASP ASVS)
  • V1.3.6
  • V1.5.3
  • V5.3.2
  • V10.4.7

Mitigating Controls (NIST 800-53 r5) AI

AC-4 Information Flow Enforcement partial match

Information flow enforcement can restrict which destinations the server is allowed to contact on behalf of users.

SC-7 Boundary Protection partial match

Boundary protection limits the network reach of server-initiated requests even if SSRF occurs.

SI-10 Information Input Validation partial match

Input validation directly stops untrusted URLs from being accepted and fetched without destination checks.

Mitigating Controls (NIST CSF 2.0) AI

Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→CSF cross-walk (authority under review) — links open the control.

PR.PS-06 mostly match
blocks

Secure development practices directly include input validation and destination allow-listing that prevent SSRF.

DE.CM-09 partial match
blocks

Runtime monitoring of web applications and services can detect anomalous outbound requests indicative of SSRF.

ID.RA-01 partial match
blocks

Vulnerability identification processes can discover and record SSRF flaws in web applications.

PR.IR-01 partial match
blocks

Network segmentation and egress controls can limit the damage from successful SSRF requests.

References