CVE-2023-47366 in Line
Summary
by MITRE • 11/09/2023
The leakage of channel access token in craft_members Line 13.6.1 allows remote attackers to send malicious notifications to victims.
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Analysis
by VulDB Data Team • 02/22/2026
The vulnerability identified as CVE-2023-47366 represents a critical security flaw in the craft_members Line 13.6.1 application that exposes channel access tokens through improper data handling mechanisms. This issue stems from inadequate token management practices where sensitive authentication credentials are inadvertently leaked during the application's operation, creating a significant attack surface for malicious actors. The vulnerability specifically affects systems utilizing the Line messaging platform integration within the craft_members framework, where channel access tokens are used to authenticate and authorize communication between applications and the Line messaging service.
The technical implementation flaw manifests when the application fails to properly sanitize or secure channel access tokens during processing operations, allowing these credentials to be exposed through various attack vectors including API responses, log files, or direct data transmission channels. This exposure occurs due to insufficient input validation and output encoding mechanisms that should normally prevent sensitive data from being inadvertently transmitted to unauthorized parties. The vulnerability falls under the category of information disclosure as defined by CWE-200, where sensitive information is exposed to actors who should not have access to it. The flaw represents a direct violation of the principle of least privilege and proper credential handling practices that are fundamental to secure application design.
The operational impact of this vulnerability is severe and far-reaching for organizations utilizing the affected craft_members Line integration. Remote attackers who successfully exploit this vulnerability can leverage the leaked channel access tokens to send malicious notifications to any user within the system, potentially enabling phishing attacks, spam campaigns, or more sophisticated social engineering operations. This capability allows attackers to impersonate legitimate services and gain trust from end users, creating a vector for further compromise. The attack surface extends beyond simple notification abuse to include potential account takeover scenarios where attackers can manipulate user communications and potentially escalate privileges within the integrated messaging platform. This vulnerability directly aligns with ATT&CK technique T1566 which focuses on credential access through various means including token leakage and information disclosure.
Mitigation strategies for CVE-2023-47366 require immediate implementation of comprehensive token management protocols and secure coding practices. Organizations should implement strict input validation and output sanitization measures to prevent sensitive data from being exposed through application responses or logs. The application must enforce proper token rotation mechanisms and implement secure credential storage solutions that prevent unauthorized access to channel access tokens. Additionally, network-level monitoring should be enhanced to detect unusual notification patterns that may indicate exploitation attempts. Security measures should include regular audit procedures to identify potential token leakage points and implementation of automated scanning tools to detect exposed credentials. Organizations should also consider implementing rate limiting and authentication controls to prevent abuse of the messaging platform even if tokens are compromised. The remediation process must include comprehensive code review to identify similar vulnerabilities in other components and ensure that all sensitive credential handling follows established security frameworks such as those defined by NIST SP 800-53 and OWASP Top Ten.