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CVE-2026-65660

Microsoft SharePoint Code Injection

8.8 HIGHActively exploited (CISA KEV)EPSS 2.10%
  1. Published11 Aug 2026
  2. Added to CISA KEV25 Sept 2026
  3. Remediation due28 Sept 2026
Actively exploited (CISA KEV)

Microsoft SharePoint contains a code injection vulnerability which could allow an authorized attacker to execute code over a network.

Added to KEV: 25 Sept 2026Federal remediation due: 28 Sept 2026

Description

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

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredLow
User interactionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected products

Microsoft SharePoint Server2016 · 2019 · < 16.0.19725.20522

Remediation

Fixed in
Microsoft SharePoint Server≥ 16.0.19725.20522

References

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Frequently asked

Is CVE-2026-65660 being actively exploited?

Yes. CVE-2026-65660 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, added 25 Sept 2026.

How severe is CVE-2026-65660?

CVE-2026-65660 has a CVSS 3.1 base score of 8.8, rated high. EPSS estimates a 2.10% probability of exploitation.

Which products are affected by CVE-2026-65660?

Affected products include Microsoft SharePoint Server.

How do I fix CVE-2026-65660?

Upgrade affected software to a fixed version, for example Microsoft SharePoint Server 16.0.19725.20522 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-65660 against the real software inventory on every managed device, every day. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. Because it is on the CISA KEV list, Secuno flags any affected asset as top-priority automatically. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.