CVE-2026-66305
HighCVSS 7.1Exploitation Probability (EPSS)
Low risk23th percentile - higher than 23% of all known CVEs
Summary
Use of client-side authentication in Skype for Business allows an authorized attacker to perform spoofing over a network.
Risk Assessment
Risk includes impersonation by an authorized user, potentially leading to integrity and trust issues. Attack requires privileges.
Recommendation
Apply security updates for Skype for Business. Strengthen authentication mechanisms and monitor user activities.
Other vulnerabilities in Skype for Business
See all- CVE-2026-66302Critical
External control of file name or path in Skype for Business allows an unauthorized attacker to execute code over a network.
- CVE-2023-41763MediumActively exploited
Elevation of Privilege vulnerability in Skype for Business. Technical details are not available in the description.
- CVE-2026-70297High
Absolute path traversal in Skype for Business and Microsoft Lync allows an authorized attacker to execute code over a network.
- CVE-2026-69646High
Improper verification of cryptographic signature in Skype for Business allows an unauthorized attacker to perform spoofing over an adjacent network.
- CVE-2026-69642Medium
A cross-site scripting (XSS) vulnerability in Skype for Business allows an unauthorized attacker to perform spoofing over a network.
- CVE-2026-66308Medium
An out-of-bounds read vulnerability in Skype for Business allows an authorized attacker to deny service over a network.
- CVE-2026-66307High
Integer underflow (wrap or wraparound) in Skype for Business allows an unauthorized attacker to deny service over a network.
- CVE-2026-66306Medium
A vulnerability in Skype for Business that generates error messages containing sensitive information allows an unauthorized attacker to disclose information over a network.
- CVE-2026-66304High
Server-side request forgery (SSRF) in Skype for Business allows an unauthorized attacker to disclose information over a network.
- CVE-2026-66303Medium
A null pointer dereference vulnerability in Skype for Business allows an authorized attacker to deny service over a network.
Original NVD description (English source)
Use of client-side authentication in Skype for Business allows an authorized attacker to perform spoofing over a network.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS