CVE-2026-59851

High

Open

TLP:CLEAR

Libssh: libssh: authentication bypass via missing gssapi principal check

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Description

A flaw was found in libssh. On servers with GSSAPIKeyExchange enabled, the gssapi-keyex path does not verify whether the authenticated Kerberos principal is authorized for the requested local user, allowing authenticated clients to log in as arbitrary users.

Details

CVSS Score: 8.8
CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Confidence: 90%
Published: Jul 21, 2026
Last Modified: Aug 17, 2026

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