Skype for Business Spoofing Vulnerability

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-69646
StatePUBLISHED
Assignermicrosoft
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-08 19:19:04 UTC
Updated2026-09-09 10:19:40 UTC
DescriptionImproper verification of cryptographic signature in Skype for Business allows an unauthorized attacker to perform spoofing over an adjacent network.

Risk And Classification

Primary CVSS: v3.1 8.3 HIGH from [email protected]

CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:L

EPSS: 0.002100000 probability, percentile 0.112440000 (date 2026-09-09)

Problem Types: CWE-347 | CWE-347 CWE-347: Improper Verification of Cryptographic Signature

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary8.3HIGHCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:L
3.1CNACVSS8.3HIGHCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:L/E:U/RL:O/RC:C

CVSS v3.1 Breakdown

Attack Vector
Adjacent
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
Low

CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:L

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Microsoft Skype For Business Server 2015 CU13 affected 9319.0 6.0.9319.885 custom x64-based Systems
CNA Microsoft Skype For Business Server 2019 CU8 affected 2046.0 7.0.2046.569 custom x64-based Systems
CNA Microsoft Skype For Business Server Subscription Edition CU1 affected 2046.0 7.0.2046.879 custom x64-based Systems

References

ReferenceSourceLinkTags
msrc.microsoft.com/update-guide/vulnerability/CVE-2026-69646 [email protected] msrc.microsoft.com
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

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