CVE-2026-15141 in TL-WR820N v2
Summary
by MITRE • 08/13/2026
The web interface of the affected device relies on the HTTP referrer header as part of request validation. Requests containing empty Referer value, or omitting the Referer header entirely, may be accepted and processed due to insufficient validation logic.
Successful exploitation may allow an adjacent attacker with access to the web management interface to obtain device configuration details and other sensitive information.
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Analysis
by VulDB Data Team • 08/13/2026
This vulnerability represents a critical security flaw in web application authentication and authorization mechanisms that directly impacts the integrity of device management interfaces. The issue stems from improper validation of HTTP referer headers, which should not be relied upon as primary security controls due to their inherent weaknesses and potential for manipulation. When an application accepts requests without proper validation of the referer header, it creates a pathway for unauthorized access that bypasses normal authentication checks. This particular weakness allows attackers to submit requests with either empty referer values or completely missing headers, effectively circumventing the intended access controls.
The technical implementation flaw manifests in the application's request validation logic where the system fails to enforce proper header validation procedures. According to CWE-346, this represents a lack of proper input validation for HTTP headers, specifically targeting the referer header as a security control mechanism. The vulnerability operates at the application layer and can be exploited by adjacent attackers who have network access to the web management interface, making it particularly dangerous in environments where physical or network proximity is achievable. This type of vulnerability falls under ATT&CK technique T1212, which involves exploitation of software vulnerabilities through manipulation of input validation mechanisms.
The operational impact of this vulnerability extends beyond simple unauthorized access, as successful exploitation allows attackers to obtain sensitive device configuration details and other confidential information. This exposure can lead to comprehensive system compromise, where attackers gain visibility into network topology, security configurations, authentication credentials, and potentially escalate their privileges within the affected environment. The stolen information could enable further attacks such as lateral movement, credential harvesting, or even complete system takeover depending on the device type and configuration. Organizations may experience significant operational disruption, regulatory compliance violations, and potential data breaches when such vulnerabilities are exploited in production environments.
Mitigation strategies must address both the immediate vulnerability and underlying architectural weaknesses that allow this issue to persist. The primary recommendation involves implementing robust input validation that does not rely solely on referer headers for access control decisions. Organizations should enforce multi-factor authentication mechanisms and implement proper session management controls that do not depend on potentially manipulable HTTP headers. Additionally, network segmentation and access control lists should be implemented to restrict access to management interfaces to authorized personnel only. Regular security assessments and penetration testing should be conducted to identify similar validation weaknesses in other application components. The solution aligns with NIST SP 800-53 security controls that emphasize proper input validation, authentication, and access control mechanisms as fundamental defensive measures against such exploitation techniques.