CVE-2026-121539 in MiroTalk P2P
Summary
by MITRE • 11/04/2026
A vulnerability was found in miroslavpejic85 MiroTalk P2P up to 2.0.87/2.1.38. Affected by this issue is the function CheckPassword of the file app/src/server.js of the component Socket IO Handler. Performing a manipulation of the argument peer_id results in improper access controls. It is possible to initiate the attack remotely. Upgrading to version 2.1.39 can resolve this issue. The patch is named 4e40471abc48bfc32b4b174b8844716dfc5c1471. You should upgrade the affected component.
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Analysis
by VulDB Data Team • 11/04/2026
The vulnerability identified in MiroTalk P2P versions up to 2.0.87 and 2.1.38 represents a critical failure in access control mechanisms within the application's real-time communication infrastructure. Specifically, the flaw resides in the CheckPassword function located in the app/src/server.js file, which serves as part of the Socket IO Handler component responsible for managing peer-to-peer connections. This component is central to establishing secure sessions between users participating in video conferences or chat rooms, making any weakness here particularly dangerous given the sensitive nature of real-time communication data.
The technical root cause of this vulnerability lies in improper input validation and authorization logic when processing the peer_id argument. When a remote attacker manipulates the peer_id parameter during authentication attempts, the system fails to correctly verify whether the requesting entity has legitimate authority over that specific identifier. This lack of strict enforcement allows an unauthorized actor to bypass password checks or impersonate other users by supplying crafted identifiers that the server erroneously accepts as valid. The absence of robust identity verification means that the application cannot reliably distinguish between authenticated peers and malicious actors attempting to inject themselves into existing sessions or gain administrative privileges over compromised endpoints.
From a security classification perspective, this issue aligns with CWE-287, which denotes Improper Authentication, and more specifically reflects aspects of CWE-862, Missing Authorization, as the system fails to enforce policy decisions regarding who can access specific resources based on their identity. In terms of offensive tactics, this vulnerability facilitates techniques categorized under MITRE ATT&CK T1078, Valid Accounts, where an attacker leverages stolen or forged credentials and identifiers to maintain persistence within a network environment. By exploiting the flawed peer_id handling, adversaries can potentially join private meetings without authorization, eavesdrop on confidential discussions, or disrupt service availability by injecting malicious payloads into active streams through compromised client connections.
The operational impact of this flaw is severe for organizations relying on MiroTalk P2P for secure communications. Unauthorized access to video conferencing sessions poses significant risks including data leakage of proprietary information, intellectual property theft, and potential compliance violations depending on the industry sector. Furthermore, if an attacker gains control over a peer session, they may execute further attacks such as screen sharing manipulation or microphone activation without user consent, leading to privacy breaches and reputational damage for affected entities. The ability to initiate these attacks remotely means that no physical proximity or prior local access is required, significantly lowering the barrier for exploitation by opportunistic threat actors scanning public-facing instances of the software.
To mitigate this risk, immediate action must be taken to upgrade MiroTalk P2P to version 2.1.39 or later, where the vulnerability has been addressed through improved input validation and stricter authorization checks within the Socket IO Handler. The patch associated with commit hash 4e40471abc48bfc32b4b174b8844716dfc5c1471 specifically corrects the logic errors in the CheckPassword function to ensure that peer_id values are rigorously validated against established session states and user permissions. Organizations should also implement network-level monitoring to detect anomalous connection patterns indicative of brute-force or identifier manipulation attempts while awaiting deployment of the updated software version. Regular security audits and adherence to secure coding practices for real-time communication protocols will further reduce exposure to similar access control failures in future updates.