Sonarr Authentication Bypass vulnerability_CVE-2026-30975

8.1 / 10

HIGH

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

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.

Basic Information

ID CVE-2026-30975

Source GitHub_M

Published Mar 25, 2026 at 21:08

Modified Mar 26, 2026 at 15:23

Affected Product

Vendor Sonarr

Product Sonarr

Version < 4.0.16.2942

Affected Versions Sonarr Sonarr < 4.0.16.2942

CWE Classification

CWE-290

References

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    "published": "2026-03-25T21:08:15.426Z",
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