Vulnerability Details CVE-2026-83540
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.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.004
EPSS Ranking 28.7%
CVSS Severity
CVSS v3 Score 8.8
References
Products affected by CVE-2026-83540
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cpe:2.3:a:wolfssh:wolfssh:1.4.15
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cpe:2.3:a:wolfssh:wolfssh:1.4.16
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cpe:2.3:a:wolfssh:wolfssh:1.4.17
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cpe:2.3:a:wolfssh:wolfssh:1.4.18
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cpe:2.3:a:wolfssh:wolfssh:1.4.19
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cpe:2.3:a:wolfssh:wolfssh:1.4.20
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cpe:2.3:a:wolfssh:wolfssh:1.4.21
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cpe:2.3:a:wolfssh:wolfssh:1.4.22
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cpe:2.3:a:wolfssh:wolfssh:1.5.0