CVE-2026-102860: Improper Access Control 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-2026-102860 affects Microsoft SharePoint Server Subscription Edition.
- CVSS 8.8 (High).
- No exploitation confirmed yet.
A high improper access control tracked as CVE-2026-102860 has been published in the National Vulnerability Database for Microsoft SharePoint Server Subscription Edition, with a CVSS base score of 8.8.
At a glance
- CVE
- CVE-2026-102860
- Product
- Microsoft SharePoint Server Subscription Edition
- CVSS
- 8.8 High
- Weakness
- improper access control
- Exploited
- No known exploitation
What is the vulnerability?
The NVD entry states: Improper access control 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-2026-102860
- 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-2026-102860?
CVE-2026-102860 is a improper access control vulnerability in Microsoft SharePoint Server Subscription Edition.
How severe is CVE-2026-102860?
It has a CVSS score of 8.8 High.
Is CVE-2026-102860 being exploited?
There is no public confirmation of exploitation at the time of publication.
