CVE-2026-21075 in My Galaxy
Summary
by MITRE • 08/10/2026
Improper authorization in handler for custom URL scheme in My Galaxy prior to version 6.3 allows remote attackers to access sensitive information.
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Analysis
by VulDB Data Team • 08/10/2026
This vulnerability represents a critical authorization flaw in the My Galaxy application's handling of custom URL schemes, specifically affecting versions prior to 6.3. The issue stems from insufficient validation mechanisms within the application's intent processing system that manages external URI requests. When users interact with custom URL schemes such as mygalaxy:// or similar protocols, the application fails to properly verify whether the requesting entity has appropriate permissions to access the targeted resources. This weakness creates a pathway for remote attackers to exploit the application's trust model and gain unauthorized access to sensitive information through crafted malicious URLs.
The technical implementation flaw resides in the application's custom URL scheme handler which lacks proper authorization checks before executing sensitive operations or exposing confidential data. Attackers can construct specially formatted URLs that trigger the application's internal handlers without proper authentication verification, allowing them to bypass normal access controls. This vulnerability aligns with CWE-863, which describes improper authorization conditions in software systems where the application fails to verify that an entity has adequate access rights to perform a requested operation. The flaw operates at the protocol handler level where external requests are processed, making it particularly dangerous as it can be exploited through various attack vectors including phishing campaigns, malicious websites, or compromised applications that can trigger these custom URL schemes.
The operational impact of this vulnerability extends beyond simple information disclosure, as it enables attackers to potentially access user data, personal information, or application-specific resources that should remain protected. Depending on the implementation details of My Galaxy's data handling, attackers might be able to retrieve user profiles, configuration settings, or other sensitive information stored within the application's scope. This type of vulnerability particularly affects mobile applications that implement deep linking or custom protocol handlers, as these mechanisms often require careful security consideration to prevent unauthorized access. The attack surface is further expanded when considering that many users may unknowingly trigger these malicious URLs through web browsing or email interactions.
Security mitigations for this vulnerability should focus on implementing robust authorization checks within all custom URL scheme handlers and ensuring proper validation of incoming requests before processing sensitive operations. Applications should enforce strict access control policies that validate the requesting entity's permissions, implement proper input sanitization, and employ principle of least privilege concepts when handling external protocol requests. Organizations should also consider implementing additional security measures such as request origin verification, rate limiting for suspicious URL patterns, and regular security audits of custom protocol implementations. The remediation process requires updating the application to version 6.3 or later where proper authorization checks have been implemented, following the ATT&CK framework's mitigation recommendations for protocol handler vulnerabilities. This vulnerability demonstrates the importance of secure coding practices specifically addressing external request processing and highlights how seemingly minor implementation details in URL scheme handling can create significant security risks that align with common attack patterns found in mobile application security assessments.