CVE-2026-21786 in Sametime
Summary
by MITRE • 03/05/2026
HCL Sametime for iOS is impacted by a sensitive information disclosure. Hostnames information is written in application logs and certain URLs.
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Analysis
by VulDB Data Team • 03/10/2026
CVE-2026-21786 represents a sensitive information disclosure vulnerability affecting HCL Sametime for iOS applications. This vulnerability stems from improper handling of sensitive data within application logging mechanisms, where hostnames and specific URL components are being written to log files without adequate sanitization or protection measures. The flaw manifests when the application processes network communications or establishes connections to server endpoints, inadvertently capturing and storing identifying information in plaintext within its logging infrastructure.
The technical implementation of this vulnerability aligns with CWE-200, which addresses the exposure of sensitive information to an unauthorized actor. The iOS application's logging subsystem appears to lack proper input validation and sanitization routines that would normally filter out sensitive hostnames and URL parameters before being committed to persistent storage. This creates an attack surface where adversaries with access to application logs can extract valuable reconnaissance information including server hostnames, domain names, and potentially authentication endpoints that could be leveraged for further exploitation.
From an operational impact perspective, this vulnerability compromises the confidentiality of network infrastructure information that should remain protected. Attackers who gain access to application logs through various means such as device compromise, unauthorized administrative access, or insecure log storage practices can obtain critical hostnames that may reveal internal network topology, server configurations, and potentially authentication mechanisms. The disclosed URL information could expose endpoint patterns that aid in identifying application architecture and potentially reveal vulnerable components or misconfigurations within the communication infrastructure.
The vulnerability demonstrates weaknesses in the application's secure coding practices and logging security controls, particularly concerning the handling of network communications data. It represents a failure to implement proper information flow control and sensitive data protection mechanisms within mobile application environments. Organizations deploying HCL Sametime for iOS should consider this vulnerability in their risk assessment frameworks, as it could enable attackers to perform more targeted reconnaissance activities and potentially facilitate subsequent exploitation attempts against the identified infrastructure components.
Mitigation strategies should focus on implementing comprehensive log sanitization procedures that automatically filter out hostnames, URLs, and other sensitive information before logging operations occur. Application developers should ensure that logging mechanisms employ proper data masking or redaction techniques for network-related information. Additionally, organizations should implement secure log storage practices including access controls, encryption, and regular log rotation procedures to minimize the potential impact of information disclosure. This vulnerability also highlights the importance of following secure coding guidelines and conducting thorough security testing of mobile applications to identify and remediate similar information exposure issues. The ATT&CK framework categorizes this issue under T1562.001, which addresses "Taint Data" and the exploitation of insecure logging practices that can lead to information disclosure and reconnaissance activities.