CVE-2026-30975 | Sonarr 4.0.9.2244/4.0.15.2940 authentication spoofing (GHSA-h5qx-5hjf-7c9r / EUVD-2026-15990)

VDB-353512 · CVE-2026-30975 · GHSA-H5QX-5HJF-7C9R SONARR 4.0.9.2244/4.0.15.2940 AUTHENTICATION SPOOFING HISTORYDIFFRELATEJSONXMLCTI CVSS Meta Temp Score Current Exploit Price (≈) CTI Interest Score 7.0 $0-$5k 3.85+ Summaryinfo A vulnerability described as critical has been identified in Sonarr. Impacted is an unknown function. Executing a manipulation can lead to authentication spoofing. This vulnerability is tracked as CVE-2026-30975. The attack can be launched remotely. No exploit exists. Upgrading the affected component is recommended. Detailsinfo A vulnerability classified as critical was found in Sonarr. This vulnerability affects an unknown code block. The manipulation with an unknown input leads to a authentication spoofing vulnerability. The CWE definition for the vulnerability is CWE-290. This attack-focused weakness is caused by incorrectly implemented authentication schemes that are subject to spoofing attacks. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes: 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. The advisory is shared for download at github.com. This vulnerability was named CVE-2026-30975 since 03/07/2026. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. Successful exploitation requires user interaction by the victim. There are neither technical details nor an exploit publicly available. Upgrading to version 4.0.16.2942 eliminates this vulnerability. The upgrade is hosted for download at github.com. The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2026-15990). Productinfo Name Sonarr Version 4.0.9.2244 4.0.15.2940 Website Product: https://github.com/Sonarr/Sonarr/ CPE 2.3info 🔒 🔒 CPE 2.2info 🔒 🔒 CVSSv4info VulDB Vector: 🔒 VulDB Reliability: 🔍 CVSSv3info VulDB Meta Base Score: 7.2 VulDB Meta Temp Score: 7.0 VulDB Base Score: 6.3 VulDB Temp Score: 6.0 VulDB Vector: 🔒 VulDB Reliability: 🔍 CNA Base Score: 8.1 CNA Vector (GitHub_M): 🔒 CVSSv2info Vector Complexity Authentication Confidentiality Integrity Availability Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock VulDB Base Score: 🔒 VulDB Temp Score: 🔒 VulDB Reliability: 🔍 Exploitinginfo Class: Authentication spoofing CWE: CWE-290 / CWE-287 CAPEC: 🔒 ATT&CK: 🔒 Physical: No Local: No Remote: Yes Availability: 🔒 Status: Not defined Price Prediction: 🔍 Current Price Estimation: 🔒 0-Day Unlock Unlock Unlock Unlock Today Unlock Unlock Unlock Unlock Threat Intelligenceinfo Interest: 🔍 Active Actors: 🔍 Active APT Groups: 🔍 Countermeasuresinfo Recommended: Upgrade Status: 🔍 0-Day Time: 🔒 Upgrade: Sonarr 4.0.16.2942 Timelineinfo 03/07/2026 CVE reserved 03/25/2026 +18 days Advisory disclosed 03/25/2026 +0 days VulDB entry created 03/25/2026 +0 days VulDB entry last update Sourcesinfo Product: github.com Advisory: GHSA-h5qx-5hjf-7c9r Status: Confirmed CVE: CVE-2026-30975 (🔒) GCVE (CVE): GCVE-0-2026-30975 GCVE (VulDB): GCVE-100-353512 EUVD: 🔒 Entryinfo Created: 03/25/2026 23:05 Updated: 03/25/2026 23:39 Changes: 03/25/2026 23:05 (64), 03/25/2026 23:39 (1) Complete: 🔍 Cache ID: 99:08E:101 Discussion No comments yet. Languages: en. Please log in to comment. ◂ PreviousOverviewNext ▸