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CVE-2026-65660

📛 CVE Title

Microsoft SharePoint Server Spoofing Vulnerability

⬇ Download JSON

Description

<p>Improper control of generation of code ('code injection') in Microsoft Office SharePoint allows an authorized attacker to perform spoofing over a network.</p>

Overview

State
PUBLISHED
Assigner (CNA)
microsoft
CVSS severity
MEDIUM
CVSS score
CVSS 6.5 / 10 6.5 6.5 / 10
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C
Effective score
6.5 / 10 MEDIUM source: CNA overview
MSRC score
8.8 / 10 HIGH MS rating: Important · Remote Code Execution
CWE(s)
CWE-94
Reserved
—
Published
2026-08-11 07:00 UTC
Last updated
2026-09-25 07:00 UTC
Source
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-65660

NVD triage scoring NVD CVE 2.0

Layer NVD adds on top of the CNA's CVE record — published / last-modified timestamps, exploitability / impact subscores, and the FIRST.org EPSS probability that this CVE will be exploited in the wild in the next 30 days.

NVD published
2026-08-11 17:18:54 UTC
NVD last modified
2026-08-11 21:17:46 UTC
NVD CVSS v3.1
CVSS 6.5 / 10 6.5 6.5 / 10 MEDIUM source: secure@microsoft.com
NVD CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Exploitability subscore
2.8 / 10
Impact subscore
3.6 / 10

NVD / KEV / EPSS data refreshed 2026-08-12 05:17 UTC. Re-run the 🛰 Backfill from NVD button above to refresh.

European Union Vulnerability Database ENISA EUVD

ENISA's official EU repository for curated vulnerability intelligence. Carries a separate identifier (EUVD-YYYY-NNNN) and frequently exposes an earlier-published description + CVSS than NVD does.

EUVD ID
EUVD-2026-56431
Assigner
microsoft
Published
Aug 11, 2026, 5:04:55 PM
Updated
Aug 11, 2026, 11:59:00 PM
EUVD base score (CVSS 3.1)
6.5 / 10
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C
EUVD-reported EPSS
0.0000
Vendors
Microsoft
Products
Microsoft SharePoint Server 2019 (16.0.0 <16.0.10417.20198)
Microsoft SharePoint Enterprise Server 2016 (16.0.0 <16.0.5565.1001)
Microsoft SharePoint Server Subscription Edition (16.0.0 <16.0.19725.20522)
Aliases
GHSA-r94x-x846-rxqx

ENISA description: Improper control of generation of code ('code injection') in Microsoft Office SharePoint allows an authorized attacker to perform spoofing over a network.

EUVD references (1)

Microsoft Security Response Center MSRC

Microsoft's vendor-authoritative record from the Security Update Guide — its own CVSS score, impact, severity rating, exploit assessment, and KB-article fixes. Refreshed 2026-09-26 03:07 UTC (source: CVRF).

MS severity
Important
Impact
Remote Code Execution
MS CVSS base score
8.8 / 10 (temporal 7.7)
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C
Exploit assessment
Publicly Disclosed:No;Exploited:No;Latest Software Release:Exploitation Less Likely
Release
2026-Aug
Microsoft remediations / KB articles (10)
Microsoft FAQ (3)

There are multiple update packages available for some of the affected software. Do I need to install all the updates listed in the Security Updates table for the software?

Yes. Customers should apply all updates offered for the software installed on their systems. If multiple updates apply, they can be installed in any order.

I am running SharePoint Server 2016. Do the updates for SharePoint Enterprise Server 2016 also apply to the version I am running?

Yes. The same KB number applies to both SharePoint Server 2016 and SharePoint Enterprise Server 2016. Customers running either version should install the security update to be protected from this vulnerability.

How could an attacker exploit this vulnerability?

An authenticated attacker with low-level access to an affected server could send a specially crafted request to execute code on the server. User interaction is not required.

Vendor references (0)

References embedded in the original CVE record by the assigning CNA.

None in the CVE record.

Web references (11)

DuckDuckGo results ranked by threat-intel / vendor advisory domains. Generated by the 🔎 Find references (web) button above — same flow as the Remediations search.

NVD-tagged references (1)

Reference list NVD curates from the CNA record, vendor advisories, and third-party reports. The tag chips below are NVD's analyst-assigned categories.

Remediations (10)

  • Patch for Windows Defender 0-day could allow attackers to fill hard ...
    web:arstechnica.com

    A patch Microsoft released on Wednesday to fix a zero-day vulnerability in its Defender security engine may cause Windows machines to write files large enough to completely consume available disk ...

    2026-08-12 14:33 UTC
  • CVE-2026-65660 | Code Injection in Microsoft | CVETodo
    web:cvetodo.com

    CVE-2026-65660 is a CVSS 6.5 medium-severity vulnerability. Full technical analysis, mitigations , and exploit status — updated in real time.

    2026-08-12 14:33 UTC
  • Security Update Guide - Microsoft
    web:msrc.microsoft.com

    The Microsoft Security Response Center (MSRC) investigates all reports of security vulnerabilities affecting Microsoft products and services, and provides the information here as part of the ongoing effort to help you manage security risks and help keep your systems protected.

    2026-08-12 14:33 UTC
  • Security Update Guide - Microsoft Security Response Center
    web:msrc.microsoft.com

    Security Update Guide - Microsoft Security Response Center

    2026-08-12 14:33 UTC
  • Nvd - Cve-2026-20660
    web:nvd.nist.gov

    Analysis Description A path handling issue was addressed with improved logic. This issue is fixed in macOS Tahoe 26.3, macOS Sonoma 14.8.4, iOS 18.7.5 and iPadOS 18.7.5, visionOS 26.3, iOS 26.3 and iPadOS 26.3, Safari 26.3. A remote user may be able to write arbitrary files.

    2026-08-12 14:33 UTC
  • CVE-2026-65660 - vulnerability database | Vulners.com
    web:vulners.com

    CVE-2026-65660 describes an improper control of code generation (code injection) in Microsoft Office SharePoint / SharePoint Server , enabling an authorized attacker to perform spoofing over a network . The vulnerability is triggered via a network...

    2026-08-12 14:33 UTC
  • CVE-2026-65660: Patch SharePoint Server Spoofing Flaw
    web:windowsforum.com

    For CVE-2026-65660 , administrators should take these steps: Confirm the exact SharePoint Server edition, patch level, and role of each machine in every production and recovery farm before scheduling deployment.

    2026-08-12 14:33 UTC
  • Oracle Critical Patch Update Advisory - July 2026
    web:www.oracle.com

    This Critical Patch Update contains 1449 new security patches across the product families listed below. Please note that a My Oracle Support (MOS) note summarizing the content of this Critical Patch Update and other Oracle Software Security Assurance activities is located at July 2026 Critical Patch Update: Executive Summary and Analysis.

    2026-08-12 14:33 UTC
  • July 2026 Patch Tuesday: Largest Patch Tuesday 569 CVEs - Tenable
    web:www.tenable.com

    Microsoft patched 569 CVEs in July 2026 , the largest Patch Tuesday release in its history. 56 critical CVEs patched including three zero-day vulnerabilities.

    2026-08-12 14:33 UTC
  • CVE-2026-65660 - Medium Vulnerability - TheHackerWire
    web:www.thehackerwire.com

    How do I fix or mitigate CVE-2026-65660 ? To protect against CVE-2026-65660 , you should: (1) Apply the latest security patches from the vendor, (2) Check official security advisories for specific remediation steps, (3) Update affected software to the latest version, and (4) Monitor your systems for any signs of exploitation.

    2026-08-12 14:33 UTC

AI Forensic Analysis

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Raw JSON

The full cvelistV5 record. Download as CVE-2026-65660.json.

Not stored.