CVE-2026-69646
HighCVSS 8.3Exploitation Probability (EPSS)
Low risk11th percentile - higher than 11% of all known CVEs
Summary
Improper verification of cryptographic signature in Skype for Business allows an unauthorized attacker to perform spoofing over an adjacent network.
Risk Assessment
Risk includes impersonation of users or services, potentially leading to trust issues and further attacks. Attack requires access to the local network.
Recommendation
Apply security updates for Skype for Business. Restrict network access and monitor traffic for unusual patterns.
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-2026-69642Medium
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-2026-66305High
Use of client-side authentication in Skype for Business allows an authorized attacker to perform spoofing 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)
Improper verification of cryptographic signature in Skype for Business allows an unauthorized attacker to perform spoofing over an adjacent network.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS