CVE-2026-30975 (GCVE-0-2026-30975)
Vulnerability from cvelistv5 – Published: 2026-03-25 21:08 – Updated: 2026-03-26 15:23
VLAI
EPSS
VEX
Title
Sonarr Authentication Bypass vulnerability
Summary
Sonarr is a PVR for Usenet and BitTorrent users. Versions prior to 4.0.16.2942 have an authentication bypass that affected users that had disabled authentication for local addresses (Authentication Required set to: `Disabled for Local Addresses`) without a reverse proxy running in front of Sonarr that didn't not pass through the invalid header. Patches are available in version 4.0.16.2942 in the nightly/develop branch and version 4.0.16.2944 for stable/main releases. Some workarounds are available. Make sure Sonarr's Authentication Required setting is set to `Enabled`, run Sonarr behind a reverse proxy, and/or do not expose Sonarr directly to the internet and instead rely on accessing it through a VPN, Tailscale or a similar solution.
Severity
8.1 (High)
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-03-26 15:23 UTC
CWE
- CWE-290 - Authentication Bypass by Spoofing
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://github.com/Sonarr/Sonarr/security/advisor… | x_refsource_CONFIRM |
| https://github.com/Sonarr/Sonarr/releases/tag/v4.… | x_refsource_MISC |
| https://github.com/Sonarr/Sonarr/releases/tag/v4.… | x_refsource_MISC |
Impacted products
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"url": "https://github.com/Sonarr/Sonarr/releases/tag/v4.0.16.2942"
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"configurations": [
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"value": "Sonarr es un PVR para usuarios de Usenet y BitTorrent. Las versiones anteriores a la 4.0.16.2942 tienen una omisi\u00f3n de autenticaci\u00f3n que afectaba a los usuarios que hab\u00edan deshabilitado la autenticaci\u00f3n para direcciones locales (Autenticaci\u00f3n Requerida configurada como: \u0027Deshabilitada para Direcciones Locales\u0027) sin un proxy inverso ejecut\u00e1ndose delante de Sonarr que s\u00ed pasara la cabecera inv\u00e1lida. Los parches est\u00e1n disponibles en la versi\u00f3n 4.0.16.2942 en la rama nightly/develop y en la versi\u00f3n 4.0.16.2944 para las versiones stable/main. Algunas soluciones alternativas est\u00e1n disponibles. Aseg\u00farese de que la configuraci\u00f3n \u0027Autenticaci\u00f3n Requerida\u0027 de Sonarr est\u00e9 establecida en \u0027Habilitada\u0027, ejecute Sonarr detr\u00e1s de un proxy inverso, y/o no exponga Sonarr directamente a internet y, en su lugar, conf\u00ede en acceder a \u00e9l a trav\u00e9s de una VPN, Tailscale o una soluci\u00f3n similar."
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