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Response snapshot Oct 30, 2026, 19:11 UTC

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VulnerabilityCVE-2026-61826

Bazarr is a companion application to Sonarr and Radarr.

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.

At a glance

Exploited
Not known
Severity
10.0 Critical (CVSS 3.1)
Chance of exploitation
Not estimated
Sources
1 source

What to do

Check the vendor advisory for affected versions and fixes.

Read NVD CVE-2026-61826 (opens a new tab)

What happened

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.

Continue reading

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.

Scores and how they were measured

CVSS base severity

10.0

Version 3.1As of

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

Measurement source (opens a new tab)

How bad it is if exploited. Not a prediction of exploitation or proof you are exposed.

EPSS probability

Not available

A model's estimate of exploitation in the next 30 days, not certainty or your own risk.

Sources

  1. Primary source

    NVD CVE-2026-61826 (opens a new tab)

    NVD record: description, CVSS (the CNA score is preferred), affected products, and publication date. Not evidence of exploitation.

    Published Checked

  2. Primary source

    NVD CVE API 2.0 (opens a new tab)

    The NVD API page that supplied this CVE record.

    Published Date not suppliedChecked

  3. Primary source

    NVD CVE API 2.0 (opens a new tab)

    The NVD API page that supplied this CVE record.

    Published Date not suppliedChecked

  4. Primary source

    NVD CVE API 2.0 (opens a new tab)

    The NVD API page that supplied this CVE record.

    Published Date not suppliedChecked

Cite this record

For factual claims, cite the primary sources above; cite KEVWire for its compilation, dates, and classifications.

APA

KEVWire. (2026, October 30). Bazarr is a companion application to Sonarr and Radarr. (CVE-2026-61826). https://kevwire.com/record/CVE-2026-61826

MLA

"Bazarr is a companion application to Sonarr and Radarr. (CVE-2026-61826)." KEVWire, 30 Oct. 2026, kevwire.com/record/CVE-2026-61826.

Chicago

KEVWire. "Bazarr is a companion application to Sonarr and Radarr. (CVE-2026-61826)." Last modified October 30, 2026. https://kevwire.com/record/CVE-2026-61826.

Evidence summary (plain text)

Bazarr is a companion application to Sonarr and Radarr. (Oct 30, 2026).
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.
CVSS 10.0 (version 3.1; evidence as of Oct 30, 2026; https://nvd.nist.gov/vuln/detail/CVE-2026-61826).
Sources:
NVD CVE-2026-61826: https://nvd.nist.gov/vuln/detail/CVE-2026-61826
NVD CVE API 2.0: https://services.nvd.nist.gov/rest/json/cves/2.0?lastModStartDate=2026-10-30T17:10:58.916Z&lastModEndDate=2026-10-30T18:40:56.214Z&resultsPerPage=500&startIndex=0
NVD CVE API 2.0: https://services.nvd.nist.gov/rest/json/cves/2.0?lastModStartDate=2026-10-30T16:36:00.636Z&lastModEndDate=2026-10-30T18:10:56.487Z&resultsPerPage=500&startIndex=0
NVD CVE API 2.0: https://services.nvd.nist.gov/rest/json/cves/2.0?lastModStartDate=2026-10-30T16:01:04.448Z&lastModEndDate=2026-10-30T17:35:57.241Z&resultsPerPage=500&startIndex=0
Record ID: CVE-2026-61826.
Record origin: Ingested record.
AI evidence: Not assessed.
Known exploitation: Not assessed.
Zero-day status: Not assessed. KEV membership alone does not establish zero-day status.
About this data

This record was ingested from a data source. Retrieved: Oct 30, 2026, 18:40 UTC. Ingestion is not an independent editorial investigation.

NVD status: Received. Publication in the NVD is not evidence of exploitation.

A CISA KEV listing documents known exploitation, not necessarily a zero-day; absence from the catalog does not prove a vulnerability has never been exploited.

Technology tags indicate possible relevance, not verified exposure. Confirm the affected product, version, and configuration against your own inventory; KEVWire does not scan your systems.

A personal reading checklist on this device, not verified remediation.

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Record details

Record detail