CVE-2025-15039 in API Control Plane
Summary
by MITRE • 08/06/2026
The Conditional Authentication (Adaptive Authentication) script does not correctly enforce the completion of all required authentication steps when a specific multi-step pattern involving certain authenticators is configured. This allows an attacker to bypass intermediate authentication challenges by exploiting how the script handles callbacks and re-execution of authentication steps.
Successful exploitation allows a malicious actor to gain unauthorized access to a targeted user account. This vulnerability can only be exploited when all of the following conditions are met: the application login flow contains a specific secondary authenticator, the Conditional Authentication script is configured with particular event callbacks and re-executes an authentication step, the targeted user has one of the impacted authenticators enrolled, and the attacker successfully completes any preceding authentication steps.
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Analysis
by VulDB Data Team • 08/06/2026
This vulnerability represents a critical weakness in adaptive authentication systems where conditional logic fails to properly enforce multi-factor authentication requirements. The flaw exists within the authentication script's handling of callback mechanisms and re-execution processes, creating an exploitable gap in the authentication flow that allows attackers to skip required security steps. The vulnerability specifically impacts scenarios where the system is configured to require multiple authentication factors but incorrectly manages the execution path when certain authenticators are involved, leading to potential privilege escalation or unauthorized account access.
The technical implementation flaw stems from improper state management within the Conditional Authentication framework, where the script does not maintain proper validation of completed authentication steps during callback processing. When an authentication flow involves specific secondary authenticators and the system is configured to re-execute certain authentication steps through event callbacks, the script fails to verify that all required prerequisites have been successfully met before proceeding. This creates a race condition or logic flaw that allows attackers to manipulate the authentication sequence by completing only the initial steps while bypassing subsequent required challenges.
From an operational perspective, this vulnerability enables attackers to exploit the authentication system's conditional execution paths without triggering all necessary security controls. The attack requires specific preconditions including the presence of certain secondary authenticators in the user's enrollment profile and proper configuration of the Conditional Authentication script with particular callback patterns. However, once these conditions are met, an attacker can effectively skip intermediate authentication requirements by leveraging how the system handles re-execution logic, potentially gaining access to sensitive user accounts without completing all required verification steps.
The vulnerability aligns with CWE-284 Access Control Issues and specifically relates to improper authentication flow management within adaptive security systems. It also maps to ATT&CK technique T1566 credential access through social engineering and T1078 valid accounts exploitation, as successful exploitation would allow attackers to leverage legitimate user credentials without proper multi-factor verification. Organizations should implement immediate mitigations including validating all conditional authentication scripts for proper state management, reviewing callback implementations for re-execution logic, and ensuring that authentication steps cannot be bypassed through manipulation of the execution flow.
Mitigation strategies must focus on strengthening the authentication script's validation mechanisms to ensure complete prerequisite checking before proceeding through conditional paths. Security teams should conduct comprehensive reviews of all Conditional Authentication configurations to identify potential callback scenarios where re-execution could lead to bypass conditions. Implementation of additional logging and monitoring around authentication step completion and callback execution will help detect anomalous behavior patterns that may indicate exploitation attempts. Organizations should also consider implementing mandatory completion checks for all authentication factors before granting access, regardless of the conditional logic flow being executed.