CVE-2026-109485: Microsoft 365 Agents SDK Information Disclosure Vulnerability
CVE-2026-109485 is an information disclosure vulnerability in Microsoft 365 Agents SDK, rated Important by Microsoft, with a CVSS 3.1 base score of 6.3 (Medium). An attacker can exploit it remotely over the network, with low privileges and without user interaction. Microsoft has not reported exploitation in the wild and rates exploitation as less likely. Microsoft released the fix on 10 November 2026 in the November 2026 Patch Tuesday. It affects 1 product in 1 product family (Other).
Key facts
- CVE ID
- CVE-2026-109485
- Severity
- Medium CVSS 6.3
- Microsoft severity
- Important
- Impact
- Information Disclosure
- Exploited in the wild
- No
- Publicly disclosed
- No
- Exploitation likelihood
- Less Likely
- CISA KEV
- Not listed
- Released
- Last updated
- Patch Tuesday
- November 2026 Patch Tuesday
- Product families
- Other
CVSS score and vector
Microsoft scores CVE-2026-109485 at 6.3 (temporal 5.5) using CVSS 3.1. Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:N/A:N/E:U/RL:O/RC:C
| Metric | Value |
|---|---|
| Attack vector | Network |
| Attack complexity | High |
| Privileges required | Low |
| User interaction | None |
| Scope | Changed |
| Confidentiality impact | High |
| Integrity impact | None |
| Availability impact | None |
| Exploit code maturity | Unproven |
| Remediation level | Official fix |
| Report confidence | Confirmed |
Description
Server-side request forgery (ssrf) in Microsoft 365 Agents SDK allows an authorized attacker to disclose information over a network.
Affected products (1)
Other
| Product | Security update | Type | Fixed build | Restart |
|---|---|---|---|---|
| Microsoft Agent Framework SDK - dotnet | Release Notes | Security Update | 1.8.77 | Yes |
Acknowledgments
- Samet AKILLI
Revision history
| Version | Date | Description |
|---|---|---|
| 1.0 | Information published. |