CVE-2026-102863: Code Injection Flaw in Microsoft SharePoint Server Subscription Edition Scores 8.8 on CVSS
A newly published high vulnerability in Microsoft SharePoint Server Subscription Edition carries a CVSS score of 8.8. Here is what is affected and how to respond.
Key points
- CVE-2026-102863 affects Microsoft SharePoint Server Subscription Edition.
- CVSS 8.8 (High).
- No exploitation confirmed yet.
Microsoft SharePoint Server Subscription Edition is affected by CVE-2026-102863, a code injection that the National Vulnerability Database rates 8.8 out of 10.
At a glance
- CVE
- CVE-2026-102863
- Product
- Microsoft SharePoint Server Subscription Edition
- CVSS
- 8.8 High
- Weakness
- code injection
- Exploited
- No known exploitation
What is the vulnerability?
The NVD entry states: Improper control of generation of code ('code injection') in Microsoft Office SharePoint allows an authorized attacker to elevate privileges over a network.
Affected versions
| Vendor | Product | Versions |
|---|---|---|
| Microsoft | Microsoft SharePoint Server Subscription Edition | before 16.0.20326.20190 |
CVSS vector: 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.
Is it being exploited?
There is no public confirmation of exploitation at the time of publication. It does not appear in CISA's Known Exploited Vulnerabilities catalog. We will update this report if that changes.
What should you do?
- Identify whether the affected product and versions run in your environment.
- Apply the vendor update listed in the advisory as soon as it is available.
- Limit network exposure of the affected service until it is patched.
- Monitor the vendor advisory for updated guidance or exploitation reports.
What to do and how to stay safe: CVE-2026-102863
- Vulnerability severity scores ignore your specific architecture and context.
- Exploitability depends on network exposure and user behavior, not just code flaws.
- Prioritization requires continuous asset inventory and threat intelligence alignment.
Risk-based vulnerability management focuses your limited resources on the flaws that actually threaten your business. Start by mapping your critical assets and checking for active exploits to prioritize your backlog.
Step-by-step guide: Risk-Based Vulnerability Management: Prioritize Fixes by Actual Danger
General security guidance from the Threat Times newsroom. It is not confirmed advice from the organisations named in this story.
Frequently asked questions
What is CVE-2026-102863?
CVE-2026-102863 is a code injection vulnerability in Microsoft SharePoint Server Subscription Edition.
How severe is CVE-2026-102863?
It has a CVSS score of 8.8 High.
Is CVE-2026-102863 being exploited?
There is no public confirmation of exploitation at the time of publication.
