CVE-2026-66302 Skype for Business Remote Code Execution Vulnerability
An attacker can execute arbitrary code remotely by exploiting a path traversal vulnerability in Skype for Business Server.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-66302?
CVE-2026-66302 is a critical path traversal vulnerability in Microsoft Skype for Business Server 2015 CU13, published on 8 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
External control of file name or path in Skype for Business allows an unauthorized attacker to execute code over a network.
Weakness: CWE-73
Which versions are affected by CVE-2026-66302?
It affects 2 products.
Products include Microsoft Skype for Business Server, Microsoft Skype for Business Server Subscription Edition.
How do I fix CVE-2026-66302?
No fix has been published for CVE-2026-66302 yet. Limit exposure of the affected software until one is available.
Upgrade, and resolve every user-supplied path against an allowed base folder before opening it. More about Path traversal.
Is CVE-2026-66302 being exploited?
There is no known exploitation of CVE-2026-66302 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-2026-69646 Skype for Business Spoofing 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-j9qr-gj45-j8p8.