CVE-2026-69646 Skype for Business Spoofing Vulnerability
An attacker can spoof communications in Skype for Business Server by bypassing cryptographic signature verification over an adjacent network.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-69646?
CVE-2026-69646 is a high-severity vulnerability in Microsoft Skype for Business Server 2015 CU13, published on 8 Sep 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
Improper verification of cryptographic signature in Skype for Business allows an unauthorized attacker to perform spoofing over an adjacent network.
Weakness: CWE-347
Which versions are affected by CVE-2026-69646?
It affects 2 products.
Products include Microsoft Skype for Business Server, Microsoft Skype for Business Server Subscription Edition.
How do I fix CVE-2026-69646?
No fix has been published for CVE-2026-69646 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-69646 being exploited?
There is no known exploitation of CVE-2026-69646 in the wild and no public exploit code.
Other vulnerabilities in Microsoft Skype for Business Server 2015 CU13
- CVE-2023-41763 Microsoft Skype for Business Privilege Escalation
- CVE-2026-66302 Skype for Business Remote Code Execution Vulnerability
- CVE-2026-66304 Skype for Business Information Disclosure Vulnerability
- CVE-2026-66307 Skype for Business and Lync Denial of Service Vulnerability
- CVE-2023-36780 Skype for Business Remote Code Execution Vulnerability
Sources
Also known as GHSA-935c-p9xv-m74w.