CVE-2026-85873
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Improper Authorization in Skype for Business and Microsoft Lync
Vulnerability report for CVE-2026-85873, including description, CVSS score, EPSS score, affected products, exploitability, helpful resources, and attack-flow context.
Publication date: 2026-10-13
Last updated on: 2026-10-13
Assigner: Microsoft Corporation
Description
Description
Improper authorization in Skype for Business and Microsoft Lync allows an authorized attacker to elevate privileges over a network.
CVSS Scores
EPSS Scores
| Probability: | |
| Percentile: |
Meta Information
Affected Vendors & Products
| Vendor | Product | Version / Range |
|---|---|---|
| Microsoft | Skype | for Business Server 2015 CU13 9319.0 |
| Microsoft | Skype | for Business Server 2019 CU8 2046.0 |
| Microsoft | Skype | for Business Server Subscription Edition CU1 2046.0 |
| Microsoft | Skype | for Business Server Subscription Edition RTM 1.0.0 |
Helpful Resources
Exploitability
CWE
KEV
| CWE ID | Description |
|---|---|
| CWE-639 | The system's authorization functionality does not prevent one user from gaining access to another user's data or record by modifying the key value identifying the data. |
