CVE-2017-11786

high
Published 2017-10-13 · Modified 2026-05-13
CVSS v3
8.8
CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
CVSS v2
9.3
VIR risk
8.8

Description

Skype for Business in Microsoft Lync 2013 SP1 and Skype for Business 2016 allows an attacker to steal an authentication hash that can be reused elsewhere, due to how Skype for Business handles authentication requests, aka "Skype for Business Elevation of Privilege Vulnerability."

Predictions

Exploit likelihood
92%
Patch ETA

Heuristic predictions, AS-IS, for prioritization only.

Mitigations

vendor Authored 2026-05-27

Vendor advisory: secure@microsoft.com — https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2017-11786

Application impact

VendorProductVersionsFixed
windows microsoftlync2013
windows microsoftskype_for_business2016

References

CWEs

CWE-294

Verify integrity in audit chain (admin only). AS-IS.