CVE-2026-108865: high-severity vulnerability in AmoyLab Unla
AmoyLab Unla through 0.10.0 OAuth2 Authentication Bypass via /authorize
Published · Updated
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21Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 8.8epss 0.3%
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.
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N
Affected products
AmoyLab · UnlaReferences
https://github.com/AmoyLab/Unlahttps://github.com/AmoyLab/Unla/blob/v0.10.0/internal/auth/oauth.go#L86-L147https://github.com/AmoyLab/Unla/blob/v0.10.0/internal/core/server.go#L229-L261https://hackmd.io/@1ExmmukzRMWN7B4gQ4W-4Q/amoylab-unla-oauth-self-issued-token-authzhttps://www.vulncheck.com/advisories/amoylab-unla-through-0.10.0-oauth2-authentication-bypass-via-authorize