Microsoft Security Update Guide · SharePoint
Microsoft SharePoint Server Remote Code Execution Vulnerability
Published
What does this mean?
- Remote Code Execution. An attacker can run their own code on the system remotely. This is the most serious type: it can lead to taking over the system.
- It can be exploited over the network (including from the internet if the service is reachable there), with an ordinary user account and if a user takes part, for example by opening a link or file.
- CVSS 8.0 out of 10: high. Microsoft rates it Important.
- No attacks reported; Microsoft expects exploitation to be less likely.
- What should you do? Install the security update for the version you run (or a later cumulative update):
- Microsoft SharePoint Server Subscription Edition: KB5002873
16.0.19725.20384 - Microsoft SharePoint Server 2019: KB5002874
16.0.10417.20153 - Microsoft SharePoint Enterprise Server 2016: KB5002880
16.0.5556.1005
- Microsoft SharePoint Server Subscription Edition: KB5002873
- This applies to SharePoint Server you run yourself. Microsoft updates SharePoint Online in Microsoft 365.
Improper authorization in Microsoft Office SharePoint allows an authorized attacker to execute code over a network.
SharePoint Office / Microsoft 365 Apps
How do I check if I am affected?
SharePoint Server: check and update
- Check your farm build in the SharePoint Management Shell:
Or in Central Administration → Upgrade and Migration → Check product and patch installation status.(Get-SPFarm).BuildVersion - If the build is equal to or higher than the build under "Affected products and updates" below, this vulnerability is fixed. A later cumulative update includes the fix too.
- Otherwise install the update on every server in the farm, then run the SharePoint Products Configuration Wizard, or:
PSConfig.exe -cmd upgrade -inplace b2b -wait -cmd applicationcontent -install -cmd installfeatures -cmd secureresources -cmd services -install - You do not need to update SharePoint Online in Microsoft 365; Microsoft does that.
What kind of flaw is this?
- CWE-285: Improper Authorization
The software does not properly check whether a user is allowed to do something.
Key facts
Released
9 jun 2026
Last revised
10 jun 2026 (v1.1)
Impact
Remote Code Execution
Max severity
Important
Weakness
CVSS 3.1
8.0 / 7.0 (base / temporal)
Vector string
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:CPublicly disclosed
No
Exploited
No
Exploitability assessment
Exploitation Less Likely
Customer action required
Yes
Links
CVSS metrics
| Base score metrics | |
|---|---|
| Attack Vector | Network |
| Attack Complexity | Low |
| Privileges Required | Low |
| User Interaction | Required |
| Scope | Unchanged |
| Confidentiality | High |
| Integrity | High |
| Availability | High |
| Temporal score metrics | |
| Exploit Code Maturity | Unproven |
| Remediation Level | Official Fix |
| Report Confidence | Confirmed |
Affected products and updates
| Product | Update | Build |
|---|---|---|
| Microsoft SharePoint Server Subscription Edition | KB5002873 · Security Update | 16.0.19725.20384 |
| Microsoft SharePoint Server 2019 | KB5002874 · Security Update | 16.0.10417.20153 |
| Microsoft SharePoint Enterprise Server 2016 | KB5002880 · Security Update | 16.0.5556.1005 |
FAQ
- According to the CVSS metric, the attack vector is network (AV:N) and the user interaction is required (UI:R). What is the target context of the remote code execution?
- This attack requires a client to connect to a malicious server, and that could allow the attacker to gain code execution on the client.
- According to the CVSS metric, privileges required is low (PR:L). What does that mean for this vulnerability?
- Any authenticated attacker could trigger this vulnerability. It does not require admin or other elevated privileges.
- I am running SharePoint Server 2016. Do the updates for SharePoint Enterprise Server 2016 also apply to the version I am running?
- Yes. The same KB number applies to both SharePoint Server 2016 and SharePoint Enterprise Server 2016. Customers running either version should install the security update to be protected from this vulnerability.
Revisions
| Version | Date | Note |
|---|---|---|
| 1.1 | 10 jun 2026 | Updated an acknowledgement. This is an informational change only. |
| 1 | 9 jun 2026 | Information published. |
What changed in Microsoft 365 this week? →
View at Microsoft → ← All security advisories
Source: Microsoft Security Update Guide. 365Fanatic is not affiliated with Microsoft.
