CVE-2026-121430 in AzuraCast
Summary
by MITRE • 11/03/2026
AzuraCast before 0.24.0 contains a missing authorization vulnerability in the GET and POST /api/station/{station_id}/waveform/{media_id} routes, which lack Permissions middleware. Any authenticated user without station assignment can read another station's cached waveform JSON and overwrite it with attacker-supplied data, corrupting Visual Cue Editor data.
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Analysis
by VulDB Data Team • 11/03/2026
The vulnerability identified in AzuraCast versions prior to 0.24.0 represents a critical failure in access control mechanisms within the application's API layer. Specifically, the endpoints responsible for retrieving and updating waveform data associated with specific media files lack proper authorization checks. The affected routes are GET /api/station/{station_id}/waveform/{media_id} and POST /api/station/{station_id}/waveform/{media_id}. These endpoints are designed to handle visual cue information used by the Visual Cue Editor, a feature that allows station managers to mark specific points in audio tracks for automated broadcasting or playlist management. The core technical flaw is the absence of Permissions middleware on these routes, which means the application does not verify whether the authenticated user making the request has been explicitly assigned permissions for the target station identified by {station_id}.
From a technical perspective, this constitutes an Insecure Direct Object Reference (IDOR) vulnerability, categorized under CWE-639. Because the API relies on the URL parameter to identify the resource but fails to validate that the current session's user context owns or has access rights to that specific station ID, any authenticated user can manipulate resources belonging to other stations. An attacker who possesses valid credentials for a low-level account, such as a DJ or listener with no administrative privileges and no assigned station role, can enumerate station IDs through standard API discovery techniques. By crafting requests to the GET endpoint, the attacker can read sensitive configuration data stored in cached waveform JSON files from any target station. This includes precise timing markers that dictate when specific audio cues should trigger during broadcast automation.
The operational impact of this vulnerability extends beyond simple information disclosure. The POST method allows an authenticated user without proper station assignment to overwrite existing waveform data with arbitrary, attacker-supplied content. Since the Visual Cue Editor relies on these JSON files to function correctly, injecting malicious or malformed data can corrupt the visual cue configuration for a target station. This corruption may lead to broadcast errors where automated playlists fail to play correctly, audio cues trigger at incorrect times, or the editor interface becomes unusable due to invalid data structures. In a multi-tenant hosting environment or an organization with multiple distinct radio stations using AzuraCast, this lack of isolation allows lateral movement between station contexts, undermining the fundamental security boundary intended by role-based access control models.
This vulnerability aligns with MITRE ATT&CK technique T1078, Valid Accounts, as it exploits legitimate credentials to perform unauthorized actions, and specifically relates to privilege escalation or horizontal privilege abuse where a user accesses resources belonging to another entity at the same permission level. The ability to read data corresponds to reconnaissance activities that could facilitate further attacks against specific station configurations. To mitigate this issue, administrators must upgrade AzuraCast to version 0.24.0 or later, where the Permissions middleware has been correctly implemented on these API endpoints. This ensures that requests are validated against the user's assigned roles and permissions before processing. Additionally, until an upgrade is performed, implementing a reverse proxy rule to restrict access to these specific API paths for non-administrative users can provide temporary relief, although upgrading remains the definitive remediation strategy to restore proper authorization controls and prevent data corruption or information leakage.