CVE-2026-108865: AmoyLab Unla through 0.10.0 OAuth2 Authentication Bypass via /authorize
AmoyLab Unla through 0.10.0 contains an authentication bypass vulnerability that allows unauthenticated attackers to obtain valid access tokens because the OAuth2 server never authenticates a resource owner. Attackers can register a client, request a code from /authorize, and exchange it at /token to access OAuth2-protected MCP prefixes, proxied upstream APIs and injected credentials.
Affected Software
Event History
Frequently Asked Questions
Who can exploit this issue?
Any unauthenticated network attacker can exploit it. No prior account, privileges, or user interaction are required.
What does an attacker need to do to obtain access?
The attacker can register an OAuth2 client, request an authorization code from /authorize, and exchange that code at /token for a valid access token. The server does not authenticate a resource owner during this flow.
What resources may be exposed through a forged access token?
A valid token can be used to access OAuth2-protected MCP prefixes, proxied upstream APIs, and injected credentials.
Which versions are known to be affected?
AmoyLab Unla versions through 0.10.0 are identified as affected.