CVE-2026-109499
Microsoft Office SharePoint Remote Code Execution Vulnerability
Access of resource using incompatible type ('type confusion') in Microsoft Office SharePoint allows an authorized attacker to execute code over a network.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- Low
- User interaction
- None
What an attacker can affect
- Confidentiality
- High
- Integrity
- High
- Availability
- High
Exploit likelihood
What each source reports
CVE List Score used
Microsoft Office SharePoint Remote Code Execution Vulnerability
Access of resource using incompatible type ('type confusion') in Microsoft Office SharePoint allows an authorized attacker to execute code over a network.
- Record
CVE-2026-109499- CVSS 3.1
- 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 - Weakness
- CWE-843
- Updated
- 2026-11-10
EUVDEUVD-2026-122144
Access of resource using incompatible type ('type confusion') in Microsoft Office SharePoint allows an authorized attacker to execute code over a network.
- Record
EUVD-2026-122144- CVSS 3.1
- 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 - Updated
- 2026-11-10
GitHub AdvisoriesGHSA-vgp8-646v-p2rw
Access of resource using incompatible type ('type confusion') in Microsoft Office SharePoint...
Access of resource using incompatible type ('type confusion') in Microsoft Office SharePoint allows an authorized attacker to execute code over a network.
- Record
GHSA-vgp8-646v-p2rw- CVSS 3.1
- 8.8 High
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H - Weakness
- CWE-843
- Updated
- 2026-11-10
NVD
Access of resource using incompatible type ('type confusion') in Microsoft Office SharePoint allows an authorized attacker to execute code over a network.
- Record
CVE-2026-109499- CVSS 3.1
- 8.8 High
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H - Weakness
- CWE-843
- Updated
- 2026-11-11
Affected products
History
| Recorded | Changed | Sources |
|---|---|---|
| published | EUVD | |
| published | EUVD, NVD | |
| aliases, references | GitHub Advisories | |
| cwes, references, severity, title | CVE List | |
| first indexed | EUVD |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2026-109499 is a high vulnerability (CVSS 8.8) in Microsoft Sharepoint Server Subscription Edition, published November 10, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.91%, the 60th percentile. No source names a fixed version.