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CVE-2026-30975 is an authentication bypass vulnerability in Sonarr affecting versions prior to 4.0.16.2942. The issue occurs when Sonarr is configured with Authentication Required set to "Disabled for Local Addresses" and is deployed without a reverse proxy that blocks or strips the invalid forwarded-address header used in the bypass. Under those conditions, a remote attacker can cause Sonarr to treat an external request as if it originated from a trusted local address, bypassing authentication controls intended to protect the web interface. The vulnerability is classified as CWE-290.
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9 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A remote code execution vulnerability affecting Sonarr versions 4.0.19.2979 and earlier, described as a 0-day and referenced via a Metasploit exploit module that appears to abuse X-Forwarded-For and DisabledForLocalAddresses behavior.
A remote code execution vulnerability in Radarr affecting versions up to and including 6.3.0.10514, described as a 0-day and referenced with a Metasploit exploit module named radarr_customscript_rce. The context suggests exploitation may involve bypassing local-address restrictions via the X-Forwarded-For header.
A remote code execution vulnerability in Prowlarr affecting versions up to and including 2.5.2.5491, referenced as a 0-day and accompanied by Metasploit exploit usage details.
An authentication bypass vulnerability in Sonarr affecting versions prior to 4.0.16.2942, particularly when authentication for local addresses is disabled and Sonarr is exposed without a properly configured reverse proxy.
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Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
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Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.