CVE-2026-18918
Published:August 28, 2026
Updated:September 24, 2026
In Eclipse Lyo versions 2.0.0 to 7.0.0, OAuth server authorization checks can be bypassed when the 2-legged auth is supported by the server. In those cases, application that based their authz filters upon Lyo-provided "AbstractAdapterCredentialsFilter", are vulnerable. An attacked can create a provisional trusted client (valid use-case) but then it can be used as a trusted client immediately without requiring the administrator approval to clear the provisional status. The 3-legged path requiring user interaction is not vulnerable and rejects provisional clients.
Affected Packages
https://github.com/eclipse-lyo/lyo.git (GITHUB):
Affected version(s) >=v4.0.0 <v6.0.1.FinalFix Suggestion:
Update to version v6.0.1.Finalorg.eclipse.lyo.server:oauth-core (JAVA):
Affected version(s) >=4.0.0 <6.0.1.FinalFix Suggestion:
Update to version 6.0.1.FinalRelated Resources (5)
Do you need more information?
Contact UsCVSS v4
Base Score:
9.1
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
PRESENT
Privileges Required
NONE
User Interaction
NONE
Vulnerable System Confidentiality
HIGH
Vulnerable System Integrity
HIGH
Vulnerable System Availability
NONE
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
9.1
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
NONE
Weakness Type (CWE)
Incorrect Authorization
EPSS
Base Score:
0.37