🛡️ CVE-2026-30975
🟠 CVSS 8.1 — High ✅ No Known Exploit CWE-290 NVD
8.1
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

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.

Details

Severity HIGH
CVSS Score 8.1
CVSS Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N
CWE CWE-290
Public Exploit ✅ No
Source NVD
Published 2026-03-25
Updated 2026-06-02
Modified 2026-03-30
Fix URL N/A

Affected Packages

Software From version Fixed in
sonarr — 4.0.16.2942

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