High severity · published Oct 13, 2026
CVE-2026-70297
Skype for Business Remote Code Execution Vulnerability
8.8
CVSS
1.2%
EPSS
No
On KEV
Description
Absolute path traversal in Skype for Business and Microsoft Lync allows an authorized attacker to execute code over a network.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)1.2% · higher than 67% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
SF
Skype for Business Server 2015 CU13 · Microsoft
9319.0 before 6.0.9319.886 · source: vendor
SF
Skype for Business Server 2019 CU8 · Microsoft
2046.0 before 7.0.2046.583 · source: vendor
SF
Skype for Business Server Subscription Edition CU1 · Microsoft
2046.0 before 7.0.2046.889 · source: vendor
Affected product
SF
Skype for Business Server 2015 CU13
Microsoft
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-70297
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-70297
vendor-advisory
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-70297
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