An elevation of privilege vulnerability exists when Microsoft SharePoint Server and Skype for Business Server improperly handle OAuth token validation. An attacker who successfully exploited the vulnerability could bypass authentication and achieve improper access. To exploit thi
An elevation of privilege vulnerability exists when Microsoft SharePoint Server and Skype for Business Server improperly handle OAuth token validation. An attacker who successfully exploited the vulnerability could bypass authentication and achieve improper access. To exploit this vulnerability, an attacker would need to modify the token. The update addresses the vulnerability by modifying how…
| Vendor | Product | Versions |
|---|---|---|
| Microsoft | Skype for Business Server 2019 CU2 | 7.0.0 |
| Microsoft | Skype for Business Server 2015 CU 8 | 2015 CU 8 |
| Microsoft | Microsoft Lync Server 2013 | 0 |
| Microsoft | Microsoft SharePoint Enterprise Server 2016 | 16.0.0 |
| Microsoft | Microsoft SharePoint Server 2019 | 16.0.0 |
| Microsoft | Microsoft SharePoint Foundation 2013 Service Pack 1 | 15.0.0 |
Not currently listed on the CISA Known Exploited Vulnerabilities (KEV) catalog. EPSS is the best forward-looking signal — see the EPSS row above.
For the full vendor write-up, exploit chains, and reference implementations, see the references list in section 09.
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No directly-cited follow-up CVEs in the KB record for this advisory. The references list in section 09 carries the vendor cross-references.