How severe is CVE-2026-65660?

CVE-2026-65660 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2026-65660 being actively exploited?

Yes. CVE-2026-65660 is on CISA's Known Exploited Vulnerabilities (KEV) catalog, added on 2026-09-25, which means active exploitation has been confirmed. It should be prioritised for remediation.

What products are affected by CVE-2026-65660?

CVE-2026-65660 primarily affects Microsoft Sharepoint Server. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2026-65660?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Because this CVE is known to be actively exploited, treat remediation as urgent — CISA KEV typically sets a short remediation deadline.

When was CVE-2026-65660 published?

CVE-2026-65660 was published on 2026-08-11 and last updated on 2026-09-26.

CVE-2026-65660

CVE-2026-65660 is a high-severity vulnerability in Microsoft Sharepoint Server with a CVSS 3.x base score of 8.8. It is listed in CISA's Known Exploited Vulnerabilities (KEV) catalog, confirming it has been exploited in the wild (added 2026-09-25). The underlying weakness is classified as CWE-94.

Key facts

Severity: High (CVSS 3.x base score 8.8)
EPSS exploit prediction: 2% (81st percentile)
Actively exploited: Yes — listed in CISA KEV (added 2026-09-25)
Weakness: CWE-94
Affected product: Microsoft Sharepoint Server
Published: 2026-08-11
Last modified: 2026-09-26

Description

Improper control of generation of code ('code injection') in Microsoft Office SharePoint allows an authorized attacker to execute code over a network.

Frequently asked questions

What is CVE-2026-65660?: Improper control of generation of code ('code injection') in Microsoft Office SharePoint allows an authorized attacker to execute code over a network.
How severe is CVE-2026-65660?: CVE-2026-65660 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2026-65660 being actively exploited?: Yes. CVE-2026-65660 is on CISA's Known Exploited Vulnerabilities (KEV) catalog, added on 2026-09-25, which means active exploitation has been confirmed. It should be prioritised for remediation.
What products are affected by CVE-2026-65660?: CVE-2026-65660 primarily affects Microsoft Sharepoint Server. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2026-65660?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Because this CVE is known to be actively exploited, treat remediation as urgent — CISA KEV typically sets a short remediation deadline.
When was CVE-2026-65660 published?: CVE-2026-65660 was published on 2026-08-11 and last updated on 2026-09-26.

References

Affected products (3)

cpe:2.3:a:microsoft:sharepoint_server:*:*:*:*:subscription:*:*:*
cpe:2.3:a:microsoft:sharepoint_server:2016:*:*:*:enterprise:*:*:*
cpe:2.3:a:microsoft:sharepoint_server:2019:*:*:*:*:*:*:*

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