All vulnerabilities
CVE-2026-83746

Skype for Business Elevation of Privilege Vulnerability

Microsoft Skype for Business Server 2015 CU13
Open in ThreatlineRecord JSON
CVSS
8.1High
ExploitationNo known exploitationNot in CISA KEV, which does not prove it is unexploitedCISA KEV
Exploit odds (EPSS)1.01%Chance of exploitation activity in the next 30 days, higher than 62% of CVEs. Scored 23 Oct 2026FIRST EPSS
Fixed in6.0.9319.886Also 7.0.2046.583, 7.0.2046.889CVE List
Published13 Oct 2026Updated 23 Oct 2026CVE List

What fixes it

  • 6.0.9319.886Skype for Business Server 2015 CU13CVE List
  • 7.0.2046.583Skype for Business Server 2019 CU8CVE List
  • 7.0.2046.889Skype for Business Server Subscription Edition CU1CVE List

A fixed version on one release line is not the upgrade target for every line. Check your exact version and any vendor backports.

Vendor and government advisories 1

Vendors that say their products are affected, and agencies that issued alerts. Check each for the fixed release of the product you run.

Reports 1

1 outlet mention it. Reports are not confirmation; each links to its source.

Description

Absolute path traversal in Skype for Business and Microsoft Lync allows an authorized attacker to elevate privileges over a network.

Text from CVE List

Affected versions 3

  • Skype for Business Server 2015 CU13affected: 9319.0 before 6.0.9319.886CVE List
  • Skype for Business Server 2019 CU8affected: 2046.0 before 7.0.2046.583CVE List
  • Skype for Business Server Subscription Edition CU1affected: 2046.0 before 7.0.2046.889CVE List

References 1