{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-108865","assignerOrgId":"83251b91-4cc7-4094-a5c7-464a1b83ea10","state":"PUBLISHED","assignerShortName":"VulnCheck","dateReserved":"2026-10-11T13:17:24.455Z","datePublished":"2026-10-11T13:26:10.714Z","dateUpdated":"2026-10-11T13:26:10.714Z"},"containers":{"cna":{"providerMetadata":{"orgId":"83251b91-4cc7-4094-a5c7-464a1b83ea10","shortName":"VulnCheck","dateUpdated":"2026-10-11T13:26:10.714Z"},"datePublic":"2026-10-11T00:00:00.000Z","title":"AmoyLab Unla through 0.10.0 OAuth2 Authentication Bypass via /authorize","descriptions":[{"lang":"en","value":"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."}],"problemTypes":[{"descriptions":[{"lang":"en","description":"Improper Authentication","cweId":"CWE-287","type":"CWE"}]}],"affected":[{"vendor":"AmoyLab","product":"Unla","defaultStatus":"unaffected","versions":[{"version":"0","status":"affected","lessThanOrEqual":"0.10.0","versionType":"semver"}],"packageURL":"pkg:golang/github.com/amoylab/unla","repo":"https://github.com/AmoyLab/Unla"}],"metrics":[{"format":"CVSS","cvssV4_0":{"version":"4.0","vectorString":"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","attackVector":"NETWORK","attackComplexity":"LOW","attackRequirements":"NONE","privilegesRequired":"NONE","userInteraction":"NONE","vulnConfidentialityImpact":"HIGH","vulnIntegrityImpact":"LOW","vulnAvailabilityImpact":"NONE","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","subAvailabilityImpact":"NONE","baseScore":8.8,"baseSeverity":"HIGH"}},{"format":"CVSS","cvssV3_1":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"LOW","availabilityImpact":"NONE","baseScore":8.2,"baseSeverity":"HIGH"}}],"references":[{"url":"https://hackmd.io/@1ExmmukzRMWN7B4gQ4W-4Q/amoylab-unla-oauth-self-issued-token-authz","tags":["third-party-advisory"]},{"url":"https://github.com/AmoyLab/Unla/blob/v0.10.0/internal/auth/oauth.go#L86-L147","tags":["technical-description"]},{"url":"https://github.com/AmoyLab/Unla/blob/v0.10.0/internal/core/server.go#L229-L261","tags":["technical-description"]},{"url":"https://github.com/AmoyLab/Unla","tags":["product"]},{"name":"VulnCheck Advisory: AmoyLab Unla through 0.10.0 OAuth2 Authentication Bypass via /authorize","tags":["third-party-advisory"],"url":"https://www.vulncheck.com/advisories/amoylab-unla-through-0.10.0-oauth2-authentication-bypass-via-authorize"}],"credits":[{"lang":"en","value":"hieuPenguinnn","type":"finder"}],"x_generator":{"engine":"vulncheck-endgame"}}}}