CVE-2026-42998

Affected: OpenStack Keystone

An issue was discovered in OpenStack Keystone before 29.0.2. The Keystone application credential authentication plugin does not verify that the user supplied in the authentication request matches the owner of the application credential. An attacker can authenticate with their own application credential ID and secret while specifying a different user's name and domain in the request body. Keystone issues a token attributed to the victim user. The impersonated token is project-scoped and carries the intersection of the application credential's roles and the victim's actual roles on the project. This enables audit evasion, reading the victim's credentials, and acting as the victim within shared projects.

USN-8433-1 — keystone vulnerabilities

Affected: Ubuntu:22.04:LTS: keystone, Ubuntu:24.04:LTS: keystone, Ubuntu:25.10: keystone, Ubuntu:26.04:LTS: keystone

It was discovered that OpenStack Keystone allowed restricted application credentials to create EC2 credentials. An authenticated attacker with only a reader role could possibly use this issue to bypass the role restrictions imposed on the application credential. (CVE-2026-33551)

It was discovered that the OpenStack Keystone LDAP identity backend did not correctly convert the user enabled attribute to a boolean value. An attacker could possibly use this issue to authenticate as a user disabled in LDAP. This issue only affected Ubuntu 22.04 LTS, Ubuntu 24.04 LTS, and Ubuntu 25.10. (CVE-2026-40683)

It was discovered that OpenStack Keystone's application credential authentication plugin did not verify that the user supplied in an authentication request matched the credential owner. An authenticated attacker could possibly impersonate another user and gain access to their tokens and credentials. (CVE-2026-42998)

It was discovered that OpenStack Keystone's RBAC policy enforcer unconditionally merged the raw JSON request body into the policy enforcement dictionary, overwriting trusted target data. An authenticated attacker could possibly use this issue to inject arbitrary policy attributes to bypass RBAC checks. (CVE-2026-42999)

It was discovered that OpenStack Keystone allowed an attacker with the member role to escalate privileges to admin by chaining application credential impersonation with Keystone trusts. An attacker could possibly use this issue to create a persistent tr…

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CVE-2026-42998

USN-8433-1 — keystone vulnerabilities