CVE-2026-61826
CriticalCVSS 10.0Exploitation Probability (EPSS)
Low risk18th percentile - higher than 18% of all known CVEs
Summary
Prior to 1.5.7-beta.14, the `api_ns_plex` namespace in `bazarr/api/plex/oauth.py` omits `@authenticate` on its Resource handlers, allowing anonymous callers to perform configuration-mutating operations such as logging out the Plex integration, persisting an attacker-selected API key, binding an attacker-controlled Plex account token, and other `write_config()` operations. Missing OAuth state validation and attacker-controlled server URLs further enable server-side request forgery and credential exposure.
Risk Assessment
An unauthenticated attacker can persistently tamper with the Plex integration configuration, disable it, capture tokens, and use the server for SSRF with API key exposure.
Recommendation
Update Bazarr to 1.5.7-beta.14 or later, and until then restrict network access to the Plex API and review the integration configuration.
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Original NVD description (English source)
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.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS