CVE-2026-15658 in foreUP
Summary
by MITRE • 07/30/2026
A vulnerability in the foreUP customer REST API allows any authenticated, low-privilege customer to access an endpoint that returns the records of other users without checking that the caller owns the data associated with that record.
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Analysis
by VulDB Data Team • 07/30/2026
This vulnerability represents a critical authorization flaw in the foreUP customer REST API that enables privilege escalation through improper access control mechanisms. The technical implementation fails to enforce proper authentication checks when processing requests to retrieve user records, allowing low-privilege authenticated users to access sensitive data belonging to other customers within the same system. This weakness directly violates fundamental security principles of least privilege and data separation that should be enforced at the application programming interface level.
The vulnerability stems from a lack of proper resource ownership validation within the API endpoint implementation, creating an authorization bypass condition where the system does not verify whether the requesting user has legitimate access rights to the target records. This type of flaw falls under CWE-284 which specifically addresses improper access control in software systems, and aligns with ATT&CK technique T1078 which covers valid accounts and privilege escalation through unauthorized access to resources. The absence of proper access control checks at the API layer creates an opportunity for data leakage and potential identity theft scenarios.
The operational impact of this vulnerability extends beyond simple data exposure, as it enables attackers to potentially aggregate information across multiple user accounts to build comprehensive profiles or exploit relationships between different customer records. An attacker could leverage this weakness to perform reconnaissance activities, identify high-value targets within the customer base, or attempt to correlate data from multiple accounts to uncover additional system vulnerabilities. The affected system likely contains sensitive personal and business information that could be used for further attacks including social engineering, fraud, or targeted exploitation of other system components.
Organizations should implement immediate mitigations including enforcing proper access control checks at the API endpoint level, implementing comprehensive logging and monitoring of unauthorized access attempts, and conducting thorough code reviews to identify similar authorization flaws across the entire application stack. The remediation process must include validating that all data access operations properly verify user permissions against resource ownership before returning any sensitive information. Additional security measures should encompass rate limiting to prevent automated enumeration attacks, implementing proper input validation to prevent exploitation of related vulnerabilities, and establishing a robust incident response plan to address potential data breaches resulting from this authorization flaw.