CVE-2026-67993 in Upright
Summary
by MITRE • 09/29/2026
basecamp/upright at commit efe4f2e5254ac6e57e45d2261804cca74dbbca3f contains a login cross-site request forgery issue in the static credentials callback.
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Analysis
by VulDB Data Team • 09/29/2026
The vulnerability identified in basecamp/upright at commit efe4f2e5254ac6e57e45d2261804cca74dbbca3f represents a critical authentication bypass mechanism rooted in the improper implementation of Cross-Site Request Forgery protections within static credentials callbacks. This specific flaw occurs during the initialization or verification phase where hardcoded or statically configured credentials are processed by the application logic. In secure software architecture, any endpoint that accepts state-changing requests or sensitive configuration updates must validate the origin and intent of those requests to prevent unauthorized actors from forcing authenticated users or system processes into executing unintended actions. The absence of robust anti-CSRF tokens or strict same-origin policy enforcement in this callback allows an attacker to craft malicious HTTP requests that appear legitimate to the server, thereby tricking the application into accepting forged authentication data.
From a technical perspective, the core issue lies in the lack of request integrity verification for static credential updates. When a system relies on static credentials, it often assumes a higher level of trust or automation context, which can lead developers to relax security controls such as CSRF tokens under the assumption that only internal services will interact with these endpoints. However, if this endpoint is accessible via standard HTTP methods like POST or PUT from any origin without proper validation, an attacker can exploit browser-based session handling mechanisms. By hosting a malicious webpage and inducing a victim user with administrative privileges to visit it while logged into the upright application, the attacker can trigger the static credentials callback automatically. This results in the modification of authentication parameters under the context of the victim's active session or system authority, effectively allowing the attacker to inject their own credentials or alter existing ones without direct knowledge of them.
The operational impact of this vulnerability is severe, as it directly compromises the integrity and availability of the application's access control mechanisms. An successful exploitation allows an adversary to take over administrative accounts by replacing valid static tokens with maliciously crafted ones. This leads to a complete loss of confidentiality for sensitive data stored within the system, as well as potential denial of service if the attacker locks out legitimate administrators or corrupts configuration files required for normal operation. Furthermore, this vulnerability can serve as an initial foothold for more advanced attacks, such as lateral movement across networked systems that rely on these static credentials for inter-service communication. The ability to manipulate authentication logic remotely without user interaction significantly lowers the barrier for entry, making it a high-risk issue suitable for automated exploitation campaigns targeting exposed instances of this software component.
To mitigate this vulnerability, developers must implement strict Cross-Site Request Forgery protections tailored for API and callback endpoints. This includes requiring unique, unpredictable anti-CSRF tokens that are bound to the user's session or request context in every state-changing request involving static credentials. Additionally, implementing SameSite cookie attributes with a value of Strict or Lax can prevent browsers from sending cookies on cross-site requests, providing an additional layer of defense against CSRF attacks. It is also advisable to replace static credential callbacks with more dynamic authentication methods such as OAuth2 or JWT-based flows where possible, reducing the reliance on hardcoded secrets that are prone to misuse if exposed through flawed endpoints. Regular security audits and penetration testing focused on authentication workflows should be conducted to ensure that all entry points adhere to OWASP Top 10 standards regarding broken access control and cross-site scripting protections.
This vulnerability aligns with CWE-352, which describes Cross-Site Request Forgery (CSRF), specifically highlighting the failure to verify request origin for state-changing operations. It also maps to MITRE ATT&CK technique T1098, Account Manipulation, where adversaries modify accounts to maintain access or escalate privileges. By addressing these gaps through rigorous input validation and adherence to secure coding practices outlined in industry standards like OWASP ASVS, organizations can significantly reduce the risk of unauthorized authentication manipulation and protect their infrastructure from this class of attacks.