CVE-2023-48126 in mini-app on Line
Summary
by MITRE • 01/26/2024
An issue in Luxe Beauty Clinic mini-app on Line v13.6.1 allows attackers to send crafted malicious notifications via leakage of the channel access token.
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Analysis
by VulDB Data Team • 05/30/2025
The vulnerability identified as CVE-2023-48126 represents a critical security flaw within the Luxe Beauty Clinic mini-app running on Line platform version 13.6.1. This issue stems from improper handling of channel access tokens that are inadvertently exposed during the notification sending process. The flaw creates an avenue for attackers to exploit the application's communication infrastructure and potentially compromise the security of the entire messaging ecosystem. The vulnerability specifically affects the mini-app's ability to maintain proper authentication boundaries when processing notification requests, allowing unauthorized parties to leverage legitimate access credentials for malicious purposes.
The technical implementation of this vulnerability resides in the insufficient validation and sanitization of channel access tokens within the notification delivery mechanism. When the mini-app processes notification requests, it fails to properly validate the authenticity of the access token being used, creating a scenario where attackers can intercept and reuse valid tokens to send unauthorized notifications. This represents a classic case of insufficient authentication checks and token management practices, which aligns with CWE-306 - Missing Authentication for Critical Function and CWE-798 - Use of Hard-coded Credentials. The flaw operates at the application layer where the security controls are bypassed during the notification processing workflow, enabling attackers to gain unauthorized access to the communication channel.
The operational impact of this vulnerability extends beyond simple notification spamming and could enable sophisticated attack vectors including phishing campaigns, social engineering attacks, and potential data exfiltration. Attackers could leverage the compromised channel access tokens to send malicious notifications that appear legitimate to end users, potentially leading to credential theft or malware distribution. The exposure of channel access tokens creates a persistent threat vector that remains active as long as the vulnerability exists, allowing attackers to continuously send notifications without requiring additional authentication. This vulnerability particularly affects the Line platform's security model where channel access tokens are designed to provide secure communication boundaries, but the mini-app's implementation fails to maintain these boundaries properly.
Security mitigations for this vulnerability should focus on implementing robust token validation mechanisms and proper access control enforcement within the notification delivery system. Organizations should immediately implement token rotation policies and ensure that channel access tokens are properly validated before being used for notification delivery. The application should enforce strict authentication checks and implement proper session management to prevent unauthorized token reuse. Additionally, security controls should be enhanced to monitor and log all notification delivery attempts, enabling detection of anomalous behavior patterns. These measures align with ATT&CK technique T1566 - Phishing and T1071.004 - Application Layer Protocol: DNS, as they address the root cause of credential exposure and unauthorized access. The implementation of proper input validation and authentication controls will ensure that only authorized entities can utilize the notification capabilities of the mini-app, thereby protecting both the platform and its users from potential exploitation.