Jellyfin through 12.4 Authorization Bypass via GET /Items/Suggestions

Advisories

Jellyfin through 12.4 Authorization Bypass via GET /Items/Suggestions

Severity: high
Date: 10/30/2026
Affecting: jellyfin <= 12.4
CVE: CVE-2026-119551
CWE: CWE-862 Missing Authorization
CVSS: 7.1
CVSS V4 Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
References: https://github.com/jellyfin/jellyfin/blob/v12.4/Jellyfin.Api/Controllers/SuggestionsController.cs#L70-L95
GitHub Security Advisory (GHSA-9x85-gx46-6522)
https://abraxaslabs.tech/research/jellyfin-suggestions-idor
https://github.com/jellyfin/jellyfin
Credit: Abraxas Labs
Description: Jellyfin through 12.4 contains an authorization bypass vulnerability in SuggestionsController.GetSuggestions that allows authenticated non-administrator users to bypass library and parental restrictions by omitting the userId parameter. Attackers can repeatedly call GET /Items/Suggestions without userId to enumerate restricted items, including IDs and server filesystem paths, and then stream them.

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