# Microsoft Skype for Business vulnerabilities Source: https://junglewise.ai/threats/technologies/skype-for-business Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats Updated: 13 November 2026, 03:07 UTC. Rebuilt every hour. Data: https://junglewise.ai/threats/technologies/skype-for-business.json License: CC BY 4.0 with a link back Junglewise Threat Intelligence has tracked 12 vulnerabilities in Microsoft Skype for Business: 0 in the last 7 days and 11 in the last 90 days, 2 of them critical and 1 exploited in the wild. The most recent, CVE-2026-85873, was published on 13 October 2026. 1 vulnerability in the last four weeks, up from none in the four before. ## Counts - Last 7 days: 0 - Last 30 days: 0 - Last 90 days: 11 - All time: 12 (2 critical, 1 exploited in the wild) ## About Microsoft Skype for Business Unified communications platform for enterprise messaging, video conferencing, and collaboration. ## Latest Microsoft Skype for Business vulnerabilities - [CVE-2026-85873: Microsoft Skype for Business and Lync privilege escalation](https://junglewise.ai/threats/cve-2026-85873-improper-authorization-in-skype-for-business-and-microsoft-lync) (medium, CVSS 6.5, published 13 Oct 2026) - [CVE-2026-69646: Microsoft Skype for Business cryptographic signature spoofing](https://junglewise.ai/threats/cve-2026-69646-microsoft-skype-for-business-cryptographic-signature-spoofing) (high, CVSS 8.3, published 8 Sep 2026) - [CVE-2026-69642: Microsoft Skype for Business cross-site scripting in web page generation](https://junglewise.ai/threats/cve-2026-69642-microsoft-skype-for-business-cross-site-scripting-in-web-page) (medium, CVSS 6.5, published 8 Sep 2026) - [CVE-2026-66308: Microsoft Skype for Business out-of-bounds read](https://junglewise.ai/threats/cve-2026-66308-microsoft-skype-for-business-out-of-bounds-read) (medium, CVSS 6.5, published 8 Sep 2026) - [CVE-2026-66307: Microsoft Skype for Business integer underflow denial of service](https://junglewise.ai/threats/cve-2026-66307-microsoft-skype-for-business-integer-underflow-denial-of-service) (high, CVSS 7.5, published 8 Sep 2026) - [CVE-2026-66306: Microsoft Skype for Business information disclosure in error messages](https://junglewise.ai/threats/cve-2026-66306-microsoft-skype-for-business-information-disclosure-in-error) (medium, CVSS 6.5, published 8 Sep 2026) - [CVE-2026-66305: Microsoft Skype for Business authentication spoofing](https://junglewise.ai/threats/cve-2026-66305-microsoft-skype-for-business-authentication-spoofing) (high, CVSS 7.1, published 8 Sep 2026) - [CVE-2026-66304: Microsoft Skype for Business server-side request forgery](https://junglewise.ai/threats/cve-2026-66304-microsoft-skype-for-business-server-side-request-forgery) (high, CVSS 7.5, published 8 Sep 2026) - [CVE-2026-66303: Microsoft Skype for Business null pointer dereference](https://junglewise.ai/threats/cve-2026-66303-microsoft-skype-for-business-null-pointer-dereference) (medium, CVSS 6.5, published 8 Sep 2026) - [CVE-2026-66302: Microsoft Skype for Business arbitrary code execution via path traversal](https://junglewise.ai/threats/cve-2026-66302-microsoft-skype-for-business-arbitrary-code-execution-via-path) (critical, CVSS 9.8, published 8 Sep 2026) - [CVE-2026-63523: Microsoft Skype for Business XSS in web page generation](https://junglewise.ai/threats/cve-2026-63523-microsoft-skype-for-business-xss-in-web-page-generation) (medium, CVSS 6.5, published 8 Sep 2026) - [CVE-2023-41763: Microsoft Skype for Business Privilege Escalation Vulnerability](https://junglewise.ai/threats/cve-2023-41763-microsoft-skype-for-business-privilege-escalation-vulnerability) (critical, exploited in the wild, CVSS 5.3, published 10 Oct 2023) ## Most severe Microsoft Skype for Business vulnerabilities - [CVE-2023-41763: Microsoft Skype for Business Privilege Escalation Vulnerability](https://junglewise.ai/threats/cve-2023-41763-microsoft-skype-for-business-privilege-escalation-vulnerability) (critical, exploited in the wild, CVSS 5.3, published 10 Oct 2023) - [CVE-2026-66302: Microsoft Skype for Business arbitrary code execution via path traversal](https://junglewise.ai/threats/cve-2026-66302-microsoft-skype-for-business-arbitrary-code-execution-via-path) (critical, CVSS 9.8, published 8 Sep 2026) - [CVE-2026-69646: Microsoft Skype for Business cryptographic signature spoofing](https://junglewise.ai/threats/cve-2026-69646-microsoft-skype-for-business-cryptographic-signature-spoofing) (high, CVSS 8.3, published 8 Sep 2026) - [CVE-2026-66307: Microsoft Skype for Business integer underflow denial of service](https://junglewise.ai/threats/cve-2026-66307-microsoft-skype-for-business-integer-underflow-denial-of-service) (high, CVSS 7.5, published 8 Sep 2026) - [CVE-2026-66304: Microsoft Skype for Business server-side request forgery](https://junglewise.ai/threats/cve-2026-66304-microsoft-skype-for-business-server-side-request-forgery) (high, CVSS 7.5, published 8 Sep 2026) - [CVE-2026-66305: Microsoft Skype for Business authentication spoofing](https://junglewise.ai/threats/cve-2026-66305-microsoft-skype-for-business-authentication-spoofing) (high, CVSS 7.1, published 8 Sep 2026) - [CVE-2026-66308: Microsoft Skype for Business out-of-bounds read](https://junglewise.ai/threats/cve-2026-66308-microsoft-skype-for-business-out-of-bounds-read) (medium, CVSS 6.5, published 8 Sep 2026) - [CVE-2026-66303: Microsoft Skype for Business null pointer dereference](https://junglewise.ai/threats/cve-2026-66303-microsoft-skype-for-business-null-pointer-dereference) (medium, CVSS 6.5, published 8 Sep 2026) - [CVE-2026-66306: Microsoft Skype for Business information disclosure in error messages](https://junglewise.ai/threats/cve-2026-66306-microsoft-skype-for-business-information-disclosure-in-error) (medium, CVSS 6.5, published 8 Sep 2026) - [CVE-2026-85873: Microsoft Skype for Business and Lync privilege escalation](https://junglewise.ai/threats/cve-2026-85873-improper-authorization-in-skype-for-business-and-microsoft-lync) (medium, CVSS 6.5, published 13 Oct 2026) ## Vulnerabilities per week 1 vulnerability in the last four weeks, up from none in the four before. | Week of | Vulns | Critical | Exploited | | --- | --- | --- | --- | | 17 Aug 2026 | 0 | 0 | 0 | | 24 Aug 2026 | 0 | 0 | 0 | | 31 Aug 2026 | 0 | 0 | 0 | | 7 Sep 2026 | 10 | 1 | 0 | | 14 Sep 2026 | 0 | 0 | 0 | | 21 Sep 2026 | 0 | 0 | 0 | | 28 Sep 2026 | 0 | 0 | 0 | | 5 Oct 2026 | 0 | 0 | 0 | | 12 Oct 2026 | 1 | 0 | 0 | | 19 Oct 2026 | 0 | 0 | 0 | | 26 Oct 2026 | 0 | 0 | 0 | | 2 Nov 2026 | 0 | 0 | 0 | | 9 Nov 2026 | 0 | 0 | 0 | ## Other Microsoft technologies - [Microsoft Windows](https://junglewise.ai/threats/technologies/windows): 2,362 vulnerabilities - [Microsoft Windows 10](https://junglewise.ai/threats/technologies/windows-10): 589 vulnerabilities - [Microsoft Windows 11 24h2](https://junglewise.ai/threats/technologies/windows-11-24h2): 565 vulnerabilities - [Microsoft Windows 11 25h2](https://junglewise.ai/threats/technologies/windows-11-25h2): 534 vulnerabilities - [Microsoft Windows Server 2025](https://junglewise.ai/threats/technologies/windows-server-2025): 534 vulnerabilities - [Microsoft Windows Server 2022](https://junglewise.ai/threats/technologies/windows-server-2022): 528 vulnerabilities - [Microsoft Windows Server 2019](https://junglewise.ai/threats/technologies/windows-server-2019): 521 vulnerabilities - [Microsoft Windows Server 2012](https://junglewise.ai/threats/technologies/windows-server-2012): 517 vulnerabilities - [Microsoft Windows 11](https://junglewise.ai/threats/technologies/windows-11): 494 vulnerabilities - [Microsoft Windows Server 2016](https://junglewise.ai/threats/technologies/windows-server-2016): 476 vulnerabilities - [Microsoft Windows 10 1809](https://junglewise.ai/threats/technologies/windows-10-1809): 380 vulnerabilities - [Microsoft Windows 10 21h2](https://junglewise.ai/threats/technologies/windows-10-21h2): 373 vulnerabilities ## Sources NVD, GitHub Security Advisories, OSV, the CISA Known Exploited Vulnerabilities catalog, FIRST EPSS and vendor advisories. Rebuilt every hour. Cite as: Junglewise Threat Intelligence, "Microsoft Skype for Business vulnerabilities", https://junglewise.ai/threats/technologies/skype-for-business, 13 November 2026.