CVE-2026-21053 in Email
Summary
by MITRE • 07/10/2026
Improper input validation in Samsung Email prior to version 6.2.13.1 allows local attackers to create arbitrary files within the application sandbox.
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Analysis
by VulDB Data Team • 07/10/2026
This vulnerability represents a critical improper input validation flaw that exists in Samsung Email applications prior to version 6.2.13.1, creating significant security risks for users of the mobile email client. The issue stems from insufficient validation of user-supplied input during file creation operations within the application's sandbox environment, allowing local attackers to manipulate the system through crafted inputs. This weakness specifically affects how the application handles file path construction and validation when processing email attachments or other content that may contain maliciously formatted paths.
The technical implementation flaw occurs at the input sanitization layer where the Samsung Email client fails to properly validate or sanitize file paths before executing file creation operations. Attackers can exploit this by crafting specially formatted email content or attachment names that contain directory traversal sequences or other malformed path specifications. When the application processes these inputs without adequate validation, it executes file creation commands that bypass normal sandbox restrictions, potentially allowing arbitrary file creation within the application's restricted environment.
The operational impact of this vulnerability extends beyond simple local privilege escalation as it creates a persistent threat vector for attackers who can leverage the compromised email application to establish footholds within the device. This weakness enables attackers to create malicious files in locations accessible to the Samsung Email application, potentially including configuration files, cache directories, or other sensitive areas that could be exploited for further attacks. The vulnerability particularly affects mobile device security models where sandboxing is intended to isolate applications from each other and from system resources.
From a cybersecurity perspective, this issue aligns with CWE-20 which specifically addresses improper input validation as a fundamental weakness in software design. The vulnerability also maps to ATT&CK technique T1059.001 for command and scripting interpreter execution, as attackers can potentially create malicious scripts or executables within the application sandbox. Additionally, this represents a privilege escalation vector that could enable lateral movement if the compromised email application has access to sensitive user data or system resources that other applications might need to access.
The mitigation strategy for this vulnerability requires immediate deployment of Samsung Email version 6.2.13.1 or later, which includes proper input validation routines that sanitize file paths before processing. Organizations should also implement mobile device management policies that enforce automatic updates for email applications and conduct regular security assessments of mobile applications. Network administrators should monitor for suspicious email traffic patterns that might indicate exploitation attempts and consider implementing additional email security controls such as attachment filtering or sandboxing solutions to protect against similar vulnerabilities in other email clients.