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    CVE-2026-85873

    Improper authorization in Skype for Business and Microsoft Lync allows an authorized attacker to elevate privileges over a network.

    Published:Oct 13, 2026
    Last Modified:Oct 16, 2026
    EPS:Oct 13, 2026
    EPSS Score:0.00823
    CVSS Score:6.5

    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-2026-83746 (CVSS 8.1) — Absolute path traversal in Skype for Business and Microsoft Lync allows an authorized attacker to elevate priv…
    CVE-2026-70297 (CVSS 8.8) — Absolute path traversal in Skype for Business and Microsoft Lync allows an authorized attacker to execute code…
    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-2026-66305 (CVSS 7.1) — Use of client-side authentication in Skype for Business allows an authorized attacker to perform spoofing over…
    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…

    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