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7.7
OpenStack Keystone Users Can Authenticate Even When Disabled in LDAP
CVE-2026-40683
Summary
OpenStack Keystone versions before 28.0.1 have a bug that allows users who are disabled in LDAP to still log in and access resources. This is a security concern for organizations using Keystone's LDAP identity backend. To fix this, upgrade to version 28.0.1 or later, or adjust your configuration to set user_enabled_invert to True.
Original title
In OpenStack Keystone before 28.0.1, the LDAP identity backend does not convert the user enabled attribute to a boolean when the user_enabled_invert configuration option is False (the default). The...
Original description
In OpenStack Keystone before 28.0.1, the LDAP identity backend does not convert the user enabled attribute to a boolean when the user_enabled_invert configuration option is False (the default). The _ldap_res_to_model method in the UserApi class only performed string-to-boolean conversion when user_enabled_invert was True. When False, the raw string value from LDAP (e.g., "FALSE") was used directly. Since non-empty strings are truthy in Python, users marked as disabled in LDAP were treated as enabled by Keystone, allowing them to authenticate and perform actions. All deployments using the LDAP identity backend without user_enabled_invert=True or user_enabled_emulation are affected.
nvd CVSS3.1
7.7
Vulnerability type
CWE-843
Type Confusion
Published: 14 Apr 2026 · Updated: 14 Apr 2026 · First seen: 14 Apr 2026