high severityConfidence highHistorical record

SharePoint on-prem code injection RCE hits CISA KEV

Direct answer

SharePoint on-prem code injection RCE hits CISA KEV, also tracked as CVE-2026-65660 / Microsoft SharePoint Server Remote Code Execution Vulnerability / Microsoft SharePoint Code Injection Vulnerability is a high-severity threat campaign HOL Guard tracked from Aug 11, 2026 to Sep 25, 2026, verified against 5 primary sources and last reviewed Sep 25, 2026. Active tracking has ended and the record remains published as a permanent historical research record.

CISA added CVE-2026-65660 to KEV on 2026-09-25 (due 2026-09-28, forensic triage Yes). Microsoft rated the August 2026 SharePoint Server row Important Remote Code Execution via CWE-94 code injection, CVSS 8.8 with privileges required Low. Fixed builds: Subscription Edition 16.0.19725.20522 (KB5002893), 2019 16.0.10417.20198 (KB5002894), 2016/Enterprise 2016 16.0.5565.1001 (KB5002905). SharePoint Online is not in the MSRC affectedProduct list. MSRC still lists exploited: No; CISA KEV is the later exploitation signal.

Also tracked as CVE-2026-65660 · Microsoft SharePoint Server Remote Code Execution Vulnerability · Microsoft SharePoint Code Injection Vulnerability

First observed
Aug 11, 2026
Last observed
Sep 25, 2026
Last reviewed
Sep 25, 2026
Tracking ended
Sep 25, 2026

Record exports

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Uncertainty and limitations

Read the evidence limits before acting on this record.

MSRC still lists exploited: No while CISA KEV marks known exploitation. Exact in-the-wild technique details are not published in the cited advisories. Known ransomware campaign use is Unknown.

  • SharePoint Online / Microsoft 365 cloud SharePoint is not listed in MSRC affectedProduct for this CVE.
  • This is not unauthenticated RCE; privileges required are Low.
  • MSRC still lists exploited: No as of the advisory revisions cited; CISA KEV is the later signal.

Guard coverage and policy

What Guard's reviewed assertions do and do not claim for this campaign, and the reviewed starting points for defense.

No Guard coverage mapping or campaign-specific policy guidance is published for this record.

Safe next step. Campaign guidance is defensive context. It does not auto-apply policy or claim universal campaign coverage.

Open policy controlsCampaign-specific emergency policy starting point

Timeline

Reviewed events, oldest first, each tied to a verified source.

  1. Vendor action

    Microsoft published CVE-2026-65660 with August 2026 SharePoint Server security updates (KB5002893 / KB5002894 / KB5002905).

    Sources:MSRC CVE-2026-65660·KB5002893 SharePoint Server Subscription Edition

  2. Disclosure

    CISA added CVE-2026-65660 to the KEV catalog (catalogVersion 2026.09.25, dueDate 2026-09-28, forensicTriage Yes).

    Source:CISA Known Exploited Vulnerabilities catalog

  3. Update

    HOL Guard published operator blog coverage for the same-day SharePoint KEV.

    Source:HOL Guard operator write-up

Publication clock: 15.9 hours from reviewed disclosure timestamp to HOL publication; 24-hour high target; within target.

Reviewed artifacts

The specific artifacts this record concerns, as reviewed. Names and versions are shown as text; a registry link is not recorded here.

  • Microsoft SharePoint Server Subscription Edition@<16.0.19725.20522microsoftpackage
  • Microsoft SharePoint Server 2019@<16.0.10417.20198microsoftpackage
  • Microsoft SharePoint Enterprise Server 2016@<16.0.5565.1001microsoftpackage

Sources

Every claim on this record is traceable to the sources below.

Campaign questions, answered

CISA added CVE-2026-65660 to KEV on 2026-09-25 (due 2026-09-28, forensic triage Yes). Microsoft rated the August 2026 SharePoint Server row Important Remote Code Execution via CWE-94 code injection, CVSS HOL Guard tracked the campaign from Aug 11, 2026 to Sep 25, 2026.

No. Active tracking ended Sep 25, 2026; this page remains as a labeled historical research record and does not imply the threat is currently active.

The record cites 5 primary sources, names 3 reviewed artifacts, and was last fully reviewed Sep 25, 2026 by HOL Guard Security Publishing. Its uncertainty and limitations are stated on the record itself.

Campaign guidance is defensive context. It does not auto-apply policy or claim universal campaign coverage.

The permalink above is permanent. The full record can be downloaded from this page as JSON, an artifact CSV, and a STIX 2.1 bundle, and corrections can be requested through the published correction path on the record. MSRC still lists exploited: No while CISA KEV marks known exploitation. Exact in-the-wild technique details are not published in the cited advisories. Known ransomware campaign use is Unknown.

Reviewed in full by HOL Guard Security Publishing.

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Record HGTC-2026-F0AE4428