CVE-2026-33890 is a high-severity vulnerability affecting MyTube, a self-hosted downloader and player for several video websites. Prior to version 1.8.71, an unauthenticated attacker can register an arbitrary passkey and subsequently authenticate with it to obtain a full admin session. The application exposes passkey registration endpoints without requiring prior authentication, leading to serious security implications.
The severity of this vulnerability is underscored by its CVSS score of 8.9, indicating high risk. The low attack complexity and lack of required privileges or user interaction make it particularly dangerous. This combination allows attackers to compromise the application completely without any existing credentials.
Organizations should prioritize patching immediately to mitigate the risks associated with this vulnerability. The fixed version, 1.8.71, addresses the issue by implementing proper authentication for passkey registration.
Given the potential for full administrative access, organizations using MyTube must remain vigilant and ensure they are running the latest version to protect against unauthorized access.
Vulnerability Details
The vulnerability allows an unauthenticated attacker to exploit the passkey registration process. The official CVE description notes that any successfully authenticated passkey is automatically granted an administrator token, thereby providing full administrative access to the application. This flaw can lead to a complete compromise of the MyTube application, exposing sensitive information and functionalities.
The CVSS score of 8.9 categorizes this vulnerability as high severity. MyTube versions prior to 1.8.71 are affected, and the weakness is classified under CWE-284, which relates to improper access control.
Technical Analysis
The root cause of this vulnerability lies in the inadequate authentication measures for the passkey registration endpoints. Attackers may leverage this weakness via a network attack vector, given the application's exposure on the internet. The attack complexity is considered low, as no specific privileges or user interaction are required to exploit this vulnerability.
The impact on confidentiality, integrity, and availability is high. Attackers gaining administrative access can manipulate all aspects of the application, potentially leading to data leaks or service disruptions.
Risk & Impact Analysis
Risk to organizations includes complete administrative access to MyTube, allowing attackers to exploit any sensitive features or data. The potential blast radius is significant, given that compromised applications can lead to broader security incidents, affecting user data and company reputation.
Organizations should address this vulnerability in their priority patch cycle, as the implications of exploitation can be severe. The low complexity of the attack and the lack of required credentials heighten the urgency for remediation.
Exploitation Status
Signal | Status |
|---|---|
Known Exploit | No |
Public PoC | No |
Actively Exploited | No |
Ransomware Use | No |
Affected Versions
This vulnerability affects all MyTube versions prior to 1.8.71. Organizations should ensure they are using the latest version to mitigate this risk effectively.
Mitigation & Remediation
To remediate this vulnerability, organizations should upgrade to MyTube version 1.8.71 or later. If immediate patching is not possible, implementing network controls to restrict access to the application may serve as a temporary workaround. Regular monitoring and configuration hardening should also be conducted to minimize exposure.
For additional security, organizations should consider engaging in penetration testing to validate their security posture.
Detection Guidance
Organizations should monitor logs for unusual authentication attempts, particularly around the passkey registration endpoints. Behavioral anomalies such as unexpected administrative actions should also be investigated. Implementing network signatures to detect unauthorized access attempts can further enhance detection capabilities.
AppSecure Threat Intelligence Insight
CVE-2026-33890 highlights a critical gap in authentication practices that can lead to severe consequences for organizations using MyTube. The trend of exploiting inadequate access controls underscores the need for robust security measures.
This vulnerability serves as a reminder for security teams to conduct regular audits and engage in proactive security assessments. For related insights into application security, organizations may find value in reviewing application security assessments, the penetration testing methodology, and vulnerability management program design to strengthen defenses against future threats.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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