# CVE-2026-61826: Bazarr: Plex OAuth API namespace is entirely unauthenticated, allowing config tampering, integration takeover and server-side request forgery

Status: published. Published: 2026-10-30. Updated: 2026-11-05.

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.

## Remediation

No remediation reported in collected sources

## Affected products and versions

- morpheus65535 / bazarr: < 1.5.7-beta.14 (affected). Source: CNA: GitHub_M

## Severity and prioritization

- CVSS 3.1: 10 (critical); CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H; source: CNA: GitHub_M

- CISA KEV: No listing in collected sources

- EPSS: 0.26% as of 2026-11-04; percentile 18.31%

- SSVC: exploitation none; automatable yes; technical impact total; source ADP: CISA-ADP

- Weaknesses: CWE-352, CWE-862

## Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

## References

- https://github.com/morpheus65535/bazarr/security/advisories/GHSA-fvcv-hh55-x3r4 (CNA: GitHub_M; x_refsource_CONFIRM)

- https://github.com/morpheus65535/bazarr/commit/4bd29252feebd0803e84cc3ce1bdd24c3a076ed4 (CNA: GitHub_M; x_refsource_MISC)

- https://github.com/morpheus65535/bazarr/commit/f9a8a9514944be0e7b826e67cde042cebfe9c97e (CNA: GitHub_M; x_refsource_MISC)

- https://github.com/morpheus65535/bazarr/tree/v1.5.7-beta.14 (CNA: GitHub_M; x_refsource_MISC)

## Provenance

- CNA: GitHub_M: https://www.cve.org/CVERecord?id=CVE-2026-61826; retrieved 2026-11-05; source updated 2026-11-05

- FIRST EPSS: https://api.first.org/data/v1/epss?cve=CVE-2026-61826; retrieved 2026-11-05; source updated Not reported

Revision: ccf96997c9840626a42e4fedc5094373539dd5da360e8ce78b47b9f559baf9b6

Canonical: https://y2.dev/cve/CVE-2026-61826

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