CVE-2026-30975 Sonarr Authentication Bypass vulnerability
Attackers can bypass authentication in Sonarr when local authentication is disabled and no reverse proxy filters headers, allowing unauthorized access.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-30975?
CVE-2026-30975 is a high-severity authentication bypass vulnerability in Sonarr, published on 25 Mar 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official 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.
Weakness: CWE-290
Which versions are affected by CVE-2026-30975?
It affects 1 product.
Products include Sonarr Sonarr.
How do I fix CVE-2026-30975?
No fix has been published for CVE-2026-30975 yet. Limit exposure of the affected software until one is available.
Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.
Is CVE-2026-30975 being exploited?
There is no known exploitation of CVE-2026-30975 in the wild and no public exploit code.
Other vulnerabilities in Sonarr
Sources
Also known as GHSA-h5qx-5hjf-7c9r.