CVE-2026-66775 in Approuter
Summary
by MITRE • 08/11/2026
SAP Approuter does not enforce cross-site request forgery protection on the authentication flow by default. An unauthenticated attacker could craft a malicious link and trick a victim into following it. Successful exploitation could allow the attacker to bind the victim's session to an attacker-controlled identity, resulting in a low impact on integrity. There is no impact on confidentiality and availability.
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Analysis
by VulDB Data Team • 08/11/2026
The vulnerability resides within SAP Approuter's authentication flow where cross-site request forgery protection mechanisms are not enforced by default. This represents a critical design flaw that undermines the security posture of applications relying on SAP's routing infrastructure for identity management and access control. The absence of CSRF protection creates an exploitable vector that can be leveraged by malicious actors to manipulate user sessions through crafted web requests. According to CWE-352, this vulnerability maps directly to Cross-Site Request Forgery which occurs when a web application lacks proper validation of request origins and authenticity tokens. The attack surface is particularly concerning as it targets the authentication phase where session management and identity binding occur, making it a prime target for session hijacking attempts.
The technical implementation flaw manifests when an unauthenticated attacker crafts malicious links containing forged authentication parameters that appear legitimate to unsuspecting users. When victims follow these crafted links, the Approuter's default configuration fails to validate whether requests originate from trusted sources or have been properly authenticated through legitimate user interactions. This weakness allows attackers to manipulate the authentication flow by binding victim sessions to attacker-controlled identities without requiring prior authentication credentials. The vulnerability specifically impacts integrity as it enables unauthorized modification of session state and identity association, though it does not compromise confidentiality or availability aspects of the system. The low impact on integrity classification reflects that while session binding can be altered, complete system compromise is not achievable through this vector alone.
Operational exploitation of this vulnerability requires minimal technical expertise and can result in significant security implications for organizations relying on SAP Approuter for application delivery and user authentication. Attackers can leverage this weakness to perform session fixation attacks where victim sessions become associated with attacker-controlled accounts, potentially enabling unauthorized access to protected resources and data. The attack vector typically involves social engineering techniques where victims are tricked into clicking malicious links through phishing campaigns or compromised communication channels. This vulnerability affects the core identity management capabilities of SAP applications and can undermine trust in the authentication system, particularly when organizations deploy SAP Approuter without proper security hardening configurations.
Organizations should implement immediate mitigations including enabling CSRF protection mechanisms within SAP Approuter configuration settings and ensuring that all authentication endpoints validate request authenticity through proper token generation and verification processes. The implementation should align with industry best practices outlined in OWASP CSRF prevention guidelines and should be configured to enforce strict origin validation for authentication requests. Security teams must also conduct comprehensive assessments of their SAP Approuter deployments to identify and remediate similar configuration weaknesses across all application components that handle user authentication and session management. Regular security testing including penetration testing and vulnerability scanning should be performed to ensure that CSRF protections remain effective against evolving attack techniques. The mitigation approach should integrate with existing security frameworks and align with established security standards including those referenced in the ATT&CK framework for web application attacks, particularly focusing on credential access and privilege escalation techniques that leverage authentication flow weaknesses.