# 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.

- Page: https://www.vulneraibility.com/cve/CVE-2026-65660
- CVSS: 8.8
- Known exploited: yes, in CISA KEV since 2026-09-25; CISA due date 2026-09-28
- EPSS: 8.19%
- Unvetted proof-of-concept code on GitHub: 2 GitHub proofs of concept (first 2026-09-25)
- CISA SSVC: exploitation active, automatable no, technical impact total (assessed 2026-09-24)
- Weakness: CWE-94
- Published: 2026-08-11

## Affected versions

- Microsoft Microsoft SharePoint Enterprise Server 2016: affected >= 16.0.0 and < 16.0.5565.1001
- Microsoft Microsoft SharePoint Server 2019: affected >= 16.0.0 and < 16.0.10417.20198
- Microsoft Microsoft SharePoint Server Subscription Edition: affected >= 16.0.0 and < 16.0.19725.20522

A version outside these ranges is not a statement that it is unaffected.

## References

- [patch] https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-65660
- [advisory] https://blog.previdian.com/cve-2026-65660-previdian-observes-two-stage-sharepoint-exploitation-attempts/
- [other] https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-65660

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Summary, impact and action are written by the vulneraibility.com AI analysis pipeline from the CVE record, NVD, CISA and FIRST data; verify against the references.