Vulnerability · Published Sep 8, 2026 · Assigned by microsoft
CVE-2026-66302Skype for Business Remote Code Execution Vulnerability
Critical 9.8
In plain English
A critical-severity security flaw in Skype for Business Server 2015 CU13 from Microsoft. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 1.0% (higher than 62% of all known vulnerabilities).
Severity (CVSS 3.1)9.8Critical
Exploit odds (30 days)1.0%top 37.8% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official description
External control of file name or path in Skype for Business allows an unauthorized attacker to execute code over a network.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Microsoft | Skype for Business Server 2015 CU13 | 9319.0 – before 6.0.9319.885 |
| Microsoft | Skype for Business Server 2019 CU8 | 2046.0 – before 7.0.2046.569 |
| Microsoft | Skype for Business Server Subscription Edition CU1 | 2046.0 – before 7.0.2046.879 |
Weakness: CWE-73 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C
References
- Skype for Business Remote Code Execution Vulnerability vendor-advisory, patch