{"id":"CVE-2026-61826","published":"2026-10-30T17:17:27.497","lastModified":"2026-10-30T19:39:14.897","description":"Bazarr is a companion application to Sonarr and Radarr. Prior to 1.5.7-beta.14, the `api_ns_plex` namespace in `bazarr/api/plex/oauth.py` omits `@authenticate` on its Resource handlers, while normal APIs require an API key and no global authentication hook compensates. Anonymous callers can invoke `POST /api/plex/oauth/logout` to clear credentials and disable the integration, or `POST /api/plex/apikey` to persist an attacker-selected key, without a PIN, account or state precondition. `POST /api/plex/oauth/pin` and `GET /api/plex/oauth/pin/<pin_id>/check` additionally allow an attacker who completes a PIN with an attacker-controlled Plex account to bind that account's token to the instance. `PlexPinCheck` skips state validation when `state_param` is absent and merely logs a mismatch without stopping execution. `POST /api/plex/select-server`, `POST /api/plex/oauth/servers`, `POST /api/plex/webhook/create`, `POST /api/plex/webhook/delete` and `POST /api/plex/encrypt-apikey` expose further `write_config()` operations. Attacker-controlled server URLs feed later outbound requests carrying the configured API key in `X-Plex-Token`, enabling server-side request forgery and credential exposure in addition to persistent configuration tampering and integration denial of service. Version 1.5.7-beta.14 closes the anonymous API-mutation path by adding authentication; complete OAuth state validation is not established and remains a separate residual for curator review.","cvssScore":10,"cvssSeverity":"CRITICAL","cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H","cwes":["CWE-352","CWE-862"],"vendors":[],"products":[],"references":[{"url":"https://github.com/morpheus65535/bazarr/commit/4bd29252feebd0803e84cc3ce1bdd24c3a076ed4","tags":[]},{"url":"https://github.com/morpheus65535/bazarr/commit/f9a8a9514944be0e7b826e67cde042cebfe9c97e","tags":[]},{"url":"https://github.com/morpheus65535/bazarr/security/advisories/GHSA-fvcv-hh55-x3r4","tags":[]},{"url":"https://github.com/morpheus65535/bazarr/tree/v1.5.7-beta.14","tags":[]}],"exploitRefs":[{"url":"https://github.com/morpheus65535/bazarr/commit/4bd29252feebd0803e84cc3ce1bdd24c3a076ed4","tags":[]},{"url":"https://github.com/morpheus65535/bazarr/commit/f9a8a9514944be0e7b826e67cde042cebfe9c97e","tags":[]},{"url":"https://github.com/morpheus65535/bazarr/security/advisories/GHSA-fvcv-hh55-x3r4","tags":[]},{"url":"https://github.com/morpheus65535/bazarr/tree/v1.5.7-beta.14","tags":[]}],"hasPoc":true,"ai":{"summary":"Bazarr's Plex OAuth API namespace lacks authentication on several endpoints, allowing unauthenticated attackers to clear credentials, inject arbitrary API keys, bind attacker-controlled Plex accounts via PIN, and tamper with configuration, leading to credential theft, SSRF, and integration denial of service.","exploitability":"Exploitation requires only network access to the Bazarr instance and knowledge of the affected endpoints; no authentication, PIN, or prior state is required for most actions.","blast_radius":"Successful exploitation allows full compromise of the Bazarr-Plex integration, including credential theft via SSRF, persistent configuration tampering, and denial of service by disabling the integration.","remediation":"Upgrade to Bazarr version 1.5.7-beta.14 or later, which adds authentication to the affected endpoints and implements proper OAuth state validation.","detection":"Look for unauthenticated POST requests to /api/plex/oauth/logout, /api/plex/apikey, /api/plex/oauth/pin, /api/plex/select-server, /api/plex/oauth/servers, /api/plex/webhook/create, /api/plex/webhook/delete, or /api/plex/encrypt-apikey endpoints in web server access logs; also monitor for unexpected changes to Bazarr configuration files (e.g., config.yaml) or anomalous outbound requests containing X-Plex-Token headers to external domains.","tags":["auth-bypass","ssrf","credential-theft","config-tampering","dos","web"],"model":"garnet-coder","analyzedAt":"2026-10-31T08:45:15.910Z"}}