CVE-2026-83540
HighCVSS 8.8Exploitation Probability (EPSS)
Low risk25th percentile - higher than 25% of all known CVEs
Summary
When password or public key authentication is used with the Windows port of wolfSSHd, the Windows logon token acquired for one authenticated connection is not released before a token is acquired for a subsequent connection, resulting in user login poisoning between connections. A less privileged user with a valid account on the server can exploit this to force a login as a more privileged user.
Risk Assessment
A lower-privileged user can escalate privileges to a more privileged user, potentially leading to unauthorized system access.
Recommendation
Update wolfSSH to version 1.5.1 or later, which includes the fix, and consider using alternative authentication methods.
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Original NVD description (English source)
When password or public key authentication is used with the Windows port of wolfSSHd, the Windows logon token acquired for one authenticated connection is not released before a token is acquired for a subsequent connection, resulting in user login poisoning between connections. A less privileged user with a valid account on the server can exploit this to force a login as a more privileged user. The vulnerability was introduced with the initial Windows port of wolfSSHd in wolfSSH version 1.4.15 and affects all versions through 1.5.0. Non-Windows builds of wolfSSHd are not affected.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS