CVE-2026-66302CWE-73

CVE-2026-66302

Critical · published September 8, 2026

CVSS v3.1
9.8
EPSS
1%
Percentile
61.7
In the wild
Unconfirmed
What it is

External control of file name or path in Skype for Business allows an unauthorized attacker to execute code over a network.

The record
Technical detail
CVSS v3.1
9.8 · CRITICAL
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS v4.0
Not supplied
EPSS
0.00974 · 61.7th percentile
Weakness
CWE-73 · External Control of File Name or Path
Published
2026-09-08T23:18Z
Affected products (6)
ProductVersionsFixed in
microsoft/skype_for_business_serverall versions—
microsoft/skype_for_business_serverall versions—
microsoft/skype_for_business_serverall versions—
microsoft/skype_for_business_serverall versions—
microsoft/skype_for_business_serverall versions—
microsoft/skype_for_business_server_subscription_editionall versions—
References (1)
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-66302 · [email protected]
EPSS history
Timeline
  • 10 SEP 03:17Z
    EPSS moved — → 1%
    epss
  • 08 SEP 18:30Z
    Skype for Business Remote Code Execution Vulnerability
    cvelistv5