PatchTheCVECVE-2026-65660: Microsoft SharePoint Code Injection Vulnerability
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HIGH 8.8EXPLOITEDWATCHLISTUPGRADE
CVE-2026-65660 is a high-severity flaw (CVSS 8.8) affecting sharepoint server, reported as exploited in the wild. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
Improper control of generation of code ('code injection') in Microsoft Office SharePoint allows an authorized attacker to execute code over a network.
Why this priority
- High severity
- Exploited in the wild (CISA KEV)
- On your watchlist
A fixed release or distro patch exists.
Risk facts
| CVSS score | 8.8 (High) |
| Attack vector | Network (remote) |
| Attack complexity | Low |
| Privileges needed | Low |
| User interaction | None |
| EPSS exploit chance | 2.1% (top 18%) |
| CISA exploited list | Yes, fix due 2026-09-28 |
| Weakness | CWE-94 |
| Published | 2026-08-11 |
| Last modified | 2026-09-26 |
Publisher (CNA): Microsoft Corporation · Vendor: microsoft
Am I affected?
Timeline
- Published CVE record published
- Exploited Added to the CISA Known Exploited Vulnerabilities list
- Updated Record last modified
- Deadline CISA due date for US federal agencies to patch
microsoft sharepoint server UPGRADE
Affected: < 16.0.19725.20522 · 2016 · 2019
Fixed in: 16.0.19725.20522
Safe to downgrade to: no unaffected older release
1. Check installed version
apt-cache policy sharepoint-server || rpm -q sharepoint-server || sharepoint-server --version
2. UPGRADE to 16.0.19725.20522 (Debian / Ubuntu)
sudo apt update && sudo apt install --only-upgrade sharepoint-server
2. UPGRADE (RHEL / Amazon Linux / Fedora)
sudo dnf upgrade sharepoint-server
Note
Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.
Exact fixes by distribution
Fedora 46 · retext · FIXED · 8.1.0-1.fc46 · FEDORA-2026-0602a84203 · source
sudo dnf upgrade --advisory=FEDORA-2026-0602a84203
Microsoft SharePoint Enterprise Server 2016 · KB5002905 · FIXED · 16.0.5565.1001 · KB5002905 · source
Install KB5002905 via Windows Update, then verify:
Get-HotFix -Id KB5002905
Microsoft SharePoint Enterprise Server 2016 · KB5002906 · FIXED · 16.0.5565.1001 · KB5002906 · source
Install KB5002906 via Windows Update, then verify:
Get-HotFix -Id KB5002906
Install KB5002894 via Windows Update, then verify:
Get-HotFix -Id KB5002894
Install KB5002896 via Windows Update, then verify:
Get-HotFix -Id KB5002896
Microsoft SharePoint Server Subscription Edition · KB5002893 · FIXED · 16.0.19725.20522 · KB5002893 · source
Install KB5002893 via Windows Update, then verify:
Get-HotFix -Id KB5002893
Public exploits and detection
Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.
- GitHub PoC: ShadowForge-Cyber/CVE-2026-65660-Poc (1 stars)
- GitHub PoC: HORKimhab/CVE-2026-65660 (0 stars)
Verify at the official source NVD · CVE Program · CISA KEV catalog · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.
Related CVEs
- CVE-2026-70321 HIGH 8.8 UPGRADE Deserialization of untrusted data in Microsoft Office SharePoint allows an authorized attacker to execute code
- CVE-2026-70326 HIGH 8.8 UPGRADE Server-side request forgery (ssrf) in Microsoft Office SharePoint allows an authorized attacker to elevate pri
- CVE-2026-57105 HIGH 8.0 UPGRADE Improper neutralization of input during web page generation ('cross-site scripting') in Microsoft Office Share