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    CVE-2026-66305

    Use of client-side authentication in Skype for Business allows an authorized attacker to perform spoofing over a network.

    Published:Sep 8, 2026
    Last Modified:Sep 9, 2026
    EPS:Sep 8, 2026
    EPSS Score:0.00302
    CVSS Score:7.1

    Affected Products

    Vendor
    Microsoft
    Product
    Skype For Business Server 2015
    Vendor
    Microsoft
    Product
    Skype For Business Server 2019
    Vendor
    Microsoft
    Product
    Skype For Business Server Subscription Edition

    Exploits

    No exploit reference

    Common Attack Pattern Enumeration and Classification (CAPEC)

    No CAPEC recorded yet

    Related CVEs

    CVE-2026-66307 (CVSS 7.5) — Integer underflow (wrap or wraparound) in Skype for Business allows an unauthorized attacker to deny service o…
    CVE-2026-66303 (CVSS 6.5) — Null pointer dereference in Skype for Business allows an authorized attacker to deny service over a network.…
    CVE-2026-69646 (CVSS 8.3) — Improper verification of cryptographic signature in Skype for Business allows an unauthorized attacker to perf…
    CVE-2026-69642 (CVSS 6.5) — Improper neutralization of input during web page generation ('cross-site scripting') in Skype for Business all…
    CVE-2026-63523 (CVSS 6.5) — Improper neutralization of input during web page generation ('cross-site scripting') in Skype for Business all…
    CVE-2026-66308 (CVSS 6.5) — Out-of-bounds read in Skype for Business allows an authorized attacker to deny service over a network.…
    CVE-2026-66306 (CVSS 6.5) — Generation of error message containing sensitive information in Skype for Business allows an unauthorized atta…
    CVE-2026-66302 (CVSS 9.8) — External control of file name or path in Skype for Business allows an unauthorized attacker to execute code ov…
    CVE-2026-66304 (CVSS 7.5) — Server-side request forgery (ssrf) in Skype for Business allows an unauthorized attacker to disclose informati…

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High