CVE-2025-6508 in API Manager
Summary
by MITRE • 08/07/2026
The Swagger UI Try-out console within the API Publisher documentation allows an external Swagger API definition URL to be loaded, overriding the existing API definitions within the Publisher portal.
By exploiting this vulnerability, malicious actors can deceive users into interacting with these overwritten API definitions. This could lead to the exposure of sensitive information or the initiation of unintended requests to backend services.
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Analysis
by VulDB Data Team • 08/07/2026
This vulnerability represents a critical security flaw in API management systems that enables unauthorized manipulation of API documentation interfaces through the Swagger UI component. The issue arises from insufficient input validation and access control mechanisms within the API Publisher portal's documentation framework, allowing external entities to inject arbitrary Swagger API definition URLs that supersede existing internal configurations. The underlying technical mechanism exploits a lack of proper URL sanitization and authorization checks, enabling attackers to specify any external endpoint that returns valid swagger.json or openapi.json content.
The operational impact of this vulnerability extends beyond simple documentation manipulation, creating potential attack vectors for information disclosure and unauthorized service interaction. When users access the API Publisher portal, they are unknowingly presented with maliciously crafted API definitions that may contain hidden endpoints, altered request parameters, or misleading endpoint descriptions. This creates opportunities for attackers to harvest sensitive data through unintended API calls, manipulate service interactions, or establish footholds within internal network boundaries. The vulnerability aligns with CWE-20, representing a classic input validation weakness where external inputs are not properly sanitized before being used in application logic.
From an attacker's perspective, this flaw enables a variety of malicious activities including man-in-the-middle attacks on API communications, credential harvesting through modified endpoint definitions, and the exploitation of trust relationships between API consumers and service providers. The vulnerability can be leveraged to redirect users to malicious endpoints that appear legitimate within the trusted API documentation interface, creating a false sense of security for unsuspecting operators. This technique particularly affects organizations using automated API discovery and documentation tools where user trust in the publisher portal is paramount.
Security mitigations should focus on implementing strict URL validation controls that only permit loading of Swagger definitions from predefined, authenticated sources within the organization's trusted network boundaries. Organizations must enforce proper access controls and authentication mechanisms before allowing any external content injection into API documentation portals. The implementation of content security policies and CORS restrictions can prevent unauthorized cross-origin resource sharing that enables this attack vector. Additionally, regular audit trails should monitor all Swagger definition loading activities to detect anomalous behavior patterns.
This vulnerability demonstrates the importance of principle of least privilege in API management systems and aligns with ATT&CK technique T1059.001 for command and scripting interpreter usage. The flaw represents a significant risk in enterprise environments where API documentation portals serve as central access points for developers and security personnel, making it particularly dangerous for organizations that rely heavily on automated API discovery processes. Organizations should implement comprehensive monitoring solutions to detect unauthorized API definition modifications and establish incident response procedures specifically addressing API documentation integrity violations. The vulnerability also highlights the need for regular security assessments of API management platforms to identify similar configuration weaknesses that could enable privilege escalation or data exposure scenarios.
The technical implementation requires robust input sanitization measures including hostname validation, protocol restriction enforcement, and authenticated source verification before any external content is rendered within the API Publisher interface. Organizations should consider implementing a whitelist approach for all external URL references and establish clear policies governing third-party API documentation integration to prevent similar vulnerabilities from emerging in other components of their API management infrastructure.