CVE-2026-65660 (GCVE-0-2026-65660)

Vulnerability from cvelistv5 – Published: 2026-08-11 17:04 – Updated: 2026-10-30 17:20
VLAI CISA CIRCL ENISA Previdian
Title
Microsoft SharePoint Server Remote Code Execution Vulnerability
Summary
Improper control of generation of code ('code injection') in Microsoft Office SharePoint allows an authorized attacker to execute code over a network.
Severity
8.8 (High)
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
SSVC
Exploitation: active Automatable: no Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-24 00:00 UTC
CWE
  • CWE-94 - Improper Control of Generation of Code ('Code Injection')
Assigner
microsoft CNA under the mitre root
CNA scorecard B 82/100 over 3838 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Microsoft Microsoft SharePoint Enterprise Server 2016 Affected: 16.0.0 , < 16.0.5565.1001 (custom)
guessed Create a notification for this product.
Microsoft Microsoft SharePoint Server 2019 Affected: 16.0.0 , < 16.0.10417.20198 (custom)
guessed Create a notification for this product.
Microsoft Microsoft SharePoint Server Subscription Edition Affected: 16.0.0 , < 16.0.19725.20522 (custom)
guessed Create a notification for this product.
Date Public
2026-08-11 14:00
CISA
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: e5c64625-8d93-46ec-b6a9-b3151ce6932e

Vulnerability ID: CVE-2026-65660

Status: Confirmed

Status Updated: 2026-09-25 00:00 UTC

Exploited: Yes

Timestamps
First Seen: 2026-09-25
Asserted: 2026-09-25
Scope
Notes: Microsoft SharePoint Code Injection Vulnerability | Affected: Microsoft / SharePoint | Description: Microsoft SharePoint contains a code injection vulnerability which could allow an authorized attacker to execute code over a network. | Required action: Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines. | Due date: 2026-09-28 | Known ransomware campaign use (KEV): Unknown | Notes (KEV): https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-65660 ; ; BOD 26-04: https://www.cisa.gov/news-events/directives/bod-26-04-prioritizing-security-updates-based-risk ; Forensics Triage Requirements: https://www.cisa.gov/news-events/directives/bod-26-04-implementation-guidance-prioritizing-security-updates-based-risk ; https://nvd.nist.gov/vuln/detail/CVE-2026-65660
Evidence

Type: Vendor Report

Signal: Successful Exploitation

Confidence: 80%

Source: cisa-kev

Details
Cwes CWE-94
Feed CISA Known Exploited Vulnerabilities Catalog
Product SharePoint
Due Date 2026-09-28
Date Added 2026-09-25
Vendorproject Microsoft
Vulnerabilityname Microsoft SharePoint Code Injection Vulnerability
Knownransomwarecampaignuse Unknown
References
Created: 2026-09-25 16:00 UTC | Updated: 2026-09-25 16:00 UTC
CIRCL
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: 90083a0b-893c-4122-89f1-126717a3621b

Vulnerability ID: CVE-2026-65660

Status: Confirmed

Status Updated: 2026-10-16 07:28 UTC

Exploited: Yes

Characteristics
Remote Code Execution: Yes
Authentication Required: No
Local Access Required: Remote
Severity: 100.0
Timestamps
First Seen: 2026-09-26
Asserted: 2026-10-16
Last Seen: 2026-10-16
Created: 2026-10-16 07:28 UTC | Updated: 2026-10-16 07:28 UTC
ENISA
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: fb2a3a27-31bc-4da8-a95f-ff55f3f6462e

Vulnerability ID: CVE-2026-65660

Status: Confirmed

Status Updated: 2026-09-25 00:00 UTC

Exploited: Yes

Timestamps
First Seen: 2026-09-25
Asserted: 2026-09-25
Scope
Notes: Affected: Microsoft / Microsoft SharePoint Server 2019, Microsoft SharePoint Enterprise Server 2016, Microsoft SharePoint Server Subscription Edition | Description: Improper control of generation of code ('code injection') in Microsoft Office SharePoint allows an authorized attacker to execute code over a user network | Exploitation type: unknown | CWEs: CWE-94 | Origin source: CSIRT-IE | Notes: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-65660
Evidence

Type: Csirt Report

Signal: Successful Exploitation

Confidence: 75%

Source: enisa-cnw-kev

Details
Cwes CWE-94
Euvd EUVD-2026-56431
Notes https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-65660
Catalog ENISA / EU CSIRTs Network (CNW) KEV JSON
Product Microsoft SharePoint Server 2019, Microsoft SharePoint Enterprise Server 2016, Microsoft SharePoint Server Subscription Edition
Datereported 2026/09/25
Originsource CSIRT-IE
Patchedsince
Vendorproject Microsoft
Exploitationtype unknown
Vulnerabilityname
Threatactorsexploiting
References
Created: 2026-09-26 23:00 UTC | Updated: 2026-09-28 08:00 UTC
Previdian
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: cf4216fb-e807-4062-8066-f8e3e06f3cb9

Vulnerability ID: CVE-2026-65660

Status: Confirmed

Status Updated: 2026-09-24 12:32 UTC

Exploited: Yes

Timestamps
First Seen: 2026-09-24
Asserted: 2026-09-24
Scope
Notes: Microsoft SharePoint Server Remote Code Execution Vulnerability | Affected: Microsoft / Microsoft SharePoint Enterprise Server 2016, Microsoft SharePoint Server 2019, Microsoft SharePoint Server Subscription Edition | CVSS: 8.8 (HIGH) | EPSS: 0.08189 | Used in malware: unknown | Listed 1 day ahead of CISA KEV | Not yet in CISA KEV: False
Evidence

Type: Public Report

Signal: Successful Exploitation

Confidence: 70%

Source: previdian

Details
Feed Previdian (previdian.com)
Title Microsoft SharePoint Server Remote Code Execution Vulnerability
Cve Id CVE-2026-65660
Vendor Microsoft
Ghsa Id GHSA-R94X-X846-RXQX
Product Microsoft SharePoint Enterprise Server 2016, Microsoft SharePoint Server 2019, Microsoft SharePoint Server Subscription Edition
Added Date 2026-09-24T12:32:16.826Z
Cvss Score 8.8
Epss Score 0.08189
Previous Ids
Cvss Severity HIGH
Virtual Patch True
Cvss Estimated False
Epss Percentile 0.94877
Used In Malware unknown
Vulnerability Id CVE-2026-65660
Ahead Of Cisa Kev 
{
  "count": 1,
  "unit": "day"
}
Not Yet In Cisa Kev False
References
Created: 2026-09-25 13:00 UTC | Updated: 2026-11-04 13:01 UTC
Show details on NVD website
To clipboard 

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              "scenarios": [
                {
                  "lang": "en-US",
                  "value": "GENERAL"
                }
              ]
            }
          ],
          "problemTypes": [
            {
              "descriptions": [
                {
                  "cweId": "CWE-94",
                  "description": "CWE-94: Improper Control of Generation of Code (\u0027Code Injection\u0027)",
                  "lang": "en-US",
                  "type": "CWE"
                }
              ]
            }
          ],
          "providerMetadata": {
            "dateUpdated": "2026-10-30T17:20:39.794Z",
            "orgId": "f38d906d-7342-40ea-92c1-6c4a2c6478c8",
            "shortName": "microsoft"
          },
          "references": [
            {
              "name": "Microsoft SharePoint Server Remote Code Execution Vulnerability",
              "tags": [
                "vendor-advisory",
                "patch"
              ],
              "url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-65660"
            }
          ],
          "title": "Microsoft SharePoint Server Remote Code Execution Vulnerability"
        }
      },
      "cveMetadata": {
        "assignerOrgId": "f38d906d-7342-40ea-92c1-6c4a2c6478c8",
        "assignerShortName": "microsoft",
        "cveId": "CVE-2026-65660",
        "datePublished": "2026-08-11T17:04:55.666Z",
        "dateReserved": "2026-07-22T18:16:01.897Z",
        "dateUpdated": "2026-10-30T17:20:39.794Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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Tags
Taxonomy of the tags.




Drag nodes to arrange them. Double-click a related vulnerability to open it, or a source to visit its link. The Physics button on the left tunes the layout and the simulation; the legend at the bottom left hides or shows nodes by kind and by sighting type.

Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

JSON
How durations are calculated

Following the VTEM framework (Black Hat USA 2015), time to patch starts when the vendor or a coordinator was informed, total time to patch at discovery, and disclosure to patch at public disclosure; vendor response time runs from the report to its acknowledgement. Time to exploit and time unpatched start at the earliest discovery or report, falling back to public disclosure. Unpatched time ends at the first recorded patch, or the calculation time when no patch is recorded. Exploitation to patch shows the interval between those two events; a published proof of concept is a public exploit, not exploitation.

Each result shows its source dates. A negative interval means the end event came first; when date-only inputs leave the order open, the result says so. Date-only inputs are approximate. The earliest evidence wins: KEV report dates and sightings are labelled as such. Records describing another vulnerability are listed but never calculated from, and a PoC alone does not establish exploitation. Missing patch evidence does not prove that no patch exists. Filters below change the event list only.

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    Related by attack behaviour

    Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.