CVE-2026-88865 in AVideo
Summary
by MITRE • 09/10/2026
AVideo through commit c3edcc274c389816d434acadac07ee78eaf330c1 fails to validate restream ownership in getRestream.json.php, allowing authenticated users with canStream permission to mint tokens for arbitrary restreams. Attackers can exchange the token to retrieve other users' stream keys from getLiveKey.json.php and publish to their YouTube, Twitch, or RTMP destinations.
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Analysis
by VulDB Data Team • 09/10/2026
The vulnerability identified in AVideo stems from a critical failure in access control logic within the application's REST API implementation. Specifically, the endpoint responsible for handling restreaming operations, located at getRestream.json.php, does not adequately verify that the authenticated user initiating the request is the legitimate owner of the targeted restream configuration. This oversight allows any authenticated user possessing the canStream permission to manipulate requests targeting arbitrary restream IDs associated with other users on the platform. The root cause lies in a missing server-side validation check during commit c3edcc274c389816d434acadac07ee78eaf330c1, where the application trusts client-supplied identifiers without cross-referencing them against the session's authorized resource ownership records. This represents a classic Broken Access Control flaw, categorized under CWE-284 in common vulnerability enumeration standards, which highlights failures in enforcing restrictions on actions performed by authenticated users.
The operational impact of this vulnerability is severe due to its direct consequence on credential exposure and unauthorized broadcasting capabilities. Once an attacker successfully exploits the flawed validation logic, they can mint authentication tokens for restreams that do not belong to them. These tokens are subsequently utilized when interacting with another endpoint, getLiveKey.json.php, which serves as a mechanism to retrieve live streaming keys. By exchanging the forged token through this secondary endpoint, attackers can extract sensitive stream credentials belonging to legitimate users. These extracted keys typically grant full control over the associated broadcast sessions on major platforms such as YouTube, Twitch, or generic RTMP servers. This capability enables malicious actors to hijack active streams, potentially leading to content substitution, defacement of live broadcasts, or the dissemination of harmful material under the victim's identity and channel authority.
From a threat intelligence perspective, this vulnerability aligns with MITRE ATT&CK techniques related to Credential Access and Defense Evasion. The ability to retrieve stream keys corresponds to T1528, Steal Application Access Tokens, as the attacker is extracting tokens that provide access to external services. Furthermore, the act of publishing content using stolen credentials can be viewed through the lens of T1071, Application Layer Protocol, where attackers leverage legitimate protocols and APIs to maintain persistence or execute malicious payloads without triggering immediate security alerts. The exploitation chain relies on the assumption that possession of a valid session token is sufficient for all operations within the streaming module, ignoring the principle of least privilege which dictates that users should only access resources they explicitly own or are granted permission to manage.
Mitigation strategies must focus on implementing robust server-side authorization checks at every API endpoint that handles sensitive resource manipulation. Developers should ensure that getRestream.json.php validates the ownership relationship between the authenticated user's session and the requested restream ID before processing any requests. This involves querying the database or application state to confirm that the current user is listed as the owner of the specific restream configuration being accessed. Additionally, implementing strict input validation on all parameters passed to API endpoints can help prevent unauthorized data retrieval attempts. It is also advisable to rotate compromised stream keys immediately upon detection and enforce multi-factor authentication for administrative actions involving credential management. Regular security audits focusing on access control logic are essential to identify similar flaws in other parts of the application that may rely on insufficient validation mechanisms.