Vulnerability in Microsoft Skype for Business Server 2015 CU13

[ Description ]Official description

Improper authorization in Skype for Business and Microsoft Lync allows an authorized attacker to elevate privileges over a network.

[ Fixes ]Fixes and patches

No fix or interim patch is linked from our sources yet. Check the vendor references below and limit exposure of affected systems until a fix is available.

[ Advisories ]Government CERT advisories

• CERT-FR14 Oct 2026CERTFR-2026-AVI-1316

  Multiple vulnerabilities in Microsoft products Translated from French

  Multiple vulnerabilities have been discovered in Microsoft products. Some of them allow an attacker to cause remote arbitrary code execution, privilege escalation and remote denial of service.

  CVE-2026-88086CVE-2026-70007CVE-2026-70179+141 more CVEs
• BSI CERT-Bund13 Oct 2026WID-SEC-2026-3916

  Microsoft Office products: Multiple vulnerabilities allow privilege escalation Translated from German

  CVE-2026-108433CVE-2026-97743CVE-2026-97011+209 more CVEs
• NCSC-NL13 Oct 2026NCSC-2026-0422

  Vulnerabilities fixed in Microsoft Office Translated from Dutch

  Probability/damage M/HCVE-2026-100209CVE-2026-100210CVE-2026-100211+171 more CVEs

[ References ]References

• msrc.microsoft.com/update-guide/vulnerability/CVE-2026-85873