CVE-2020-1025
9.8
CRITICAL · CVSS 3.1 · EPSS 5.9% (pctl 93)
In your normal cycle
Critical by CVSS (9.8), but no sign of active exploitation.
Description
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 Microsoft SharePoint Server and Skype for Business Server validate tokens.
Scoring
| CVSS | 9.8 (CRITICAL, v3.1) |
|---|---|
| Vector | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| EPSS | 5.85% — more likely to be exploited than 93% of all CVEs |
| Weakness | CWE-20 |
| On CISA KEV | no |
| Public exploit | none known |
| Published | 2020-07-14 |
| Last modified | 2026-06-17 |
Affected (5)
| Vendor | Product |
|---|---|
| microsoft | lync |
| microsoft | sharepoint enterprise server |
| microsoft | sharepoint foundation |
| microsoft | sharepoint server |
| microsoft | skype for business |
References
→ the Explorer · watch your stack · NVD