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.
The record classifies CVE-2026-65660 under weakness class CWE-94. Its CVSS v3 base vector states that the flaw is reachable remotely over the network, needs low-privilege credentials, needs no user interaction, and has high impact on confidentiality, integrity, availability. 3 affected-product entries are recorded, across 1 vendor, listed below. The identifier was first published 55 days ago.
Severity and exploitation probability
- CVSS v3.1 base score
- 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 - EPSS (FIRST)
- 2.1% probability of exploitation in the next 30 days, higher than 80.9% of all scored CVEs
- CISA KEV
- Listed since 2026-09-25, federal remediation deadline 2026-09-28
- Threadlinqs priority
- 9/10 — CISA KEV-listed, which Threadlinqs floors at 9
- Published
- 2026-08-11, last modified 2026-09-26
Is CVE-2026-65660 being exploited?
CISA added CVE-2026-65660 to the Known Exploited Vulnerabilities catalog on 2026-09-25, which means the agency holds evidence of exploitation in the wild; US federal civilian agencies had to remediate it by 2026-09-28 under BOD 22-01. Weaponised exploit code for CVE-2026-65660 is publicly available. 2 public proof-of-concept repositories are tracked for this identifier. It currently carries a trending score of 56 in the Threadlinqs vulnerability feed.
- ShadowForge-Cyber/CVE-2026-65660-Poc (github)
- HORKimhab/CVE-2026-65660 (github)
Affected products and versions
- Microsoft: SharePoint Enterprise Server 2016, SharePoint Server 2019, SharePoint Server Subscription Edition
How to fix CVE-2026-65660
The record marks a vendor fix as available for CVE-2026-65660. Patch reference: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-65660. Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-65660. Because CVE-2026-65660 is KEV-listed, US federal civilian agencies were required to apply the vendor fix, or stop using the product, by 2026-09-28. Apply the vendor fix referenced above to every affected product listed in this record, then confirm the running version against the vendor advisory.
Threat activity tracking CVE-2026-65660
2 tracked threats in the Threadlinqs corpus reference CVE-2026-65660, either in the campaign’s CVE list or as an indicator on the campaign record.
- CISA Adds Two Actively Exploited KEVs: SharePoint Code Injection (CVE-2026-65660) and Mikrotik RouterOS Auth Bypass (CVE-2026-67279) — CRITICAL · 2026-09-26
- CISA Adds Actively Exploited WSO2 API Manager and Adobe Commerce Flaws to KEV Catalog, Warns on SharePoint Code Injection — CRITICAL · 2026-09-25
Sources
Enriched from CVE.org, NVD, FIRST EPSS, CISA KEV, GitHub Security Advisories, public proof-of-concept repositories. Last verified by Threadlinqs on . This product uses the NVD API but is not endorsed or certified by the NVD.