wolfSSHd on Windows race condition leading to logon token reused across connections
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.
CVE-2026-83540
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-83540
wolfSSH
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"repo": "https://github.com/wolfSSL/wolfssh",
"vendor": "wolfSSL",
"modules": [
"wolfSSHd"
],
"product": "wolfSSH",
"versions": [
{
"status": "affected",
"changes": [
{
"at": "1.6.0",
"status": "unaffected"
}
],
"version": "1.4.15",
"versionType": "semver",
"lessThanOrEqual": "1.5.0"
}
],
"platforms": [
"Windows"
],
"programFiles": [
"apps/wolfsshd/auth.c"
],
"collectionURL": "https://github.com/wolfSSL/wolfssh",
"defaultStatus": "unaffected",
"programRoutines": [
{
"name": "SetupUserTokenWin"
},
{
"name": "CheckPasswordWIN"
}
]
}
]- Related CVEs
- CVE-2026-83540
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #11850 · Revision 1
- Added to Heist Feed
- Publisher date