{"id":"EUVD-2026-88033","revision":"260795e38d1d4e36829a2df8beb1dafd","records":[{"revision":"260795e38d1d4e36829a2df8beb1dafd","observedAt":"2026-11-05T03:05:12.625+00:00","statement":{"source":"euvd","id":"EUVD-2026-88033","aliases":["CVE-2026-101062","GHSA-cfp9-746c-5jrw"],"title":"Obot before v0.23.0 (affected versions <= v0.22.1) running with OBOT_SERVER_ENABLE_AUTHENTICATION=true exposes OAuth dynamic client registration without authentication and without any restriction on the redirect URIs a client may register. …","description":"Obot before v0.23.0 (affected versions <= v0.22.1) running with OBOT_SERVER_ENABLE_AUTHENTICATION=true exposes OAuth dynamic client registration without authentication and without any restriction on the redirect URIs a client may register. Because the authorization flow auto-completes for an already logged-in user with no consent screen, an attacker who registers a client pointing at their own domain and induces a logged-in victim to visit a single crafted authorization URL receives an authorization code at the attacker-controlled redirect URI and can exchange it for an access token and refresh token. The token minted by the MCP OAuth flow carries the victim's full group set in the JWT, and Obot validated only the issuer and not the audience, so the token is accepted as a bearer token against any Obot API endpoint the victim can access rather than being scoped to the requested MCP server, allowing the attacker to read or modify the victim's resources until the token is revoked. v0.23.0 adds a consent screen, restricts MCP OAuth tokens to the MCP involved in the request, and enforces audience validation.","state":0,"publishedAt":null,"modifiedAt":null,"affected":[],"metrics":[{"system":"EUVD CVSS 4.0","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N","score":8.7,"severity":null}],"references":["https://github.com/obot-platform/obot/security/advisories/GHSA-xwmw-prc4-v3cr","https://www.vulncheck.com/advisories/obot-before-0.23.0-authentication-bypass-via-oauth-dynamic-client-registration"],"sourceUrl":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-88033","license":"ENISA EUVD · source terms and attribution apply","enrichment":{"sourceStatus":null,"weaknesses":[],"productCriteria":[],"sourceDates":{"datePublished":"Sep 27, 2026, 8:49:54 PM","dateUpdated":"Sep 30, 2026, 10:11:52 PM"},"relatedAdvisories":[],"note":"EUVD source date text has no stated timezone and is retained without inventing a UTC instant. Related bulletin membership is not an alias, common cause or applicability claim. A missing vector with a zero score is treated as unrated. Complete vendor/product and underlying source evidence remains in the original JSON."},"key":"euvd:EUVD-2026-88033","identifiers":["EUVD-2026-88033","CVE-2026-101062","GHSA-cfp9-746c-5jrw"]},"retained":false,"historicalAffected":[]}],"coverage":[]}