CVE-2026-79577 in sso-master
Summary
by MITRE • 09/08/2026
An issue in the /cas/login component of sso-master v1.0.0 allows attackers to authenticate into the application without a password via sending a crafted POST request.
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Analysis
by VulDB Data Team • 09/08/2026
The vulnerability identified within the cas login endpoint of sso master version 1.0.0 represents a critical authentication bypass flaw that fundamentally undermines the integrity of single sign-on mechanisms. This specific component, responsible for handling user credential verification during the initial access phase, fails to properly validate or enforce password requirements when processing POST requests containing crafted payloads. By exploiting this logic error, an attacker can successfully authenticate into the application without providing valid credentials, effectively bypassing the primary security control designed to restrict unauthorized access. The root cause lies in the server-side validation logic which appears to accept authentication attempts where the password field is either empty or contains a specifically formatted string that tricks the verification routine into returning a success status code regardless of actual user identity.
From a technical perspective, this flaw aligns with CWE-287 Improper Authentication as defined by the Common Weakness Enumeration standards. The application fails to adequately verify one or more aspects of an entity's claimed identity during the login process. Specifically, the implementation does not enforce mandatory password presence for standard authentication flows involving username-based logins. When a POST request is directed at this endpoint with manipulated parameters that omit valid credential data yet mimic legitimate traffic patterns, the backend processing logic erroneously grants session tokens or access privileges. This behavior indicates a lack of robust input validation and insufficient checks on required fields before proceeding to create an authenticated session context for the requesting entity.
The operational impact of such a vulnerability is severe within any environment relying on this single sign-on solution for centralized identity management. Attackers can gain unauthorized access to user accounts, sensitive data repositories, or administrative interfaces without needing prior knowledge of passwords. This capability facilitates further exploitation stages including privilege escalation if higher-level roles are accessible through the same authentication mechanism. Additionally, it compromises audit trails and accountability since actions performed under bypassed sessions may be attributed to legitimate users whose credentials were never actually verified. In enterprise settings where sso master serves as a gateway for multiple downstream applications, this weakness could lead to widespread compromise across interconnected systems that trust the identity assertions issued by this central service.
Mitigation strategies must focus on reinforcing authentication logic and implementing defense-in-depth measures immediately. Developers should review the source code handling POST requests at the cas login endpoint to ensure strict validation of all required fields including password presence before proceeding with any verification steps against stored hashes or external directories. Implementing multi-factor authentication adds an additional layer that mitigates risks associated solely with credential-based bypasses even if passwords are compromised or incorrectly validated. Furthermore, deploying web application firewalls configured to detect anomalous login patterns such as repeated attempts with missing fields can provide temporary protection while patches are developed and deployed. Regular security audits focusing on authentication flows will help identify similar weaknesses across other endpoints within the sso master architecture ensuring comprehensive resilience against identity-based attacks aligned with techniques documented in MITRE ATT&CK framework under initial access categories involving credential stuffing or phishing variants that exploit weak verification processes.