CVE-2026-78356 in OTRS
Summary
by MITRE • 10/12/2026
The OTRS Agent Frontend configuration endpoint can be accessed without authentication. This allows unauthenticated remote users to retrieve internal application configuration that is intended for use by the authenticated Agent Frontend. The exposed information may include configured frontend routes and their associated authorization groups, authentication configuration, enabled product features, third-party integration settings, and other implementation details.
The exposed configuration does not directly contain user credentials or provide unauthorized modification of the OTRS configuration. However, the disclosed information may assist an attacker in fingerprinting the affected OTRS installation and identifying enabled functionality or security-relevant configuration that could be used to prepare further attacks.
This issue affects OTRS:
* 8.0.X * 2023.X * 2024.X * 2025.X * 2026.X before 2026.7.X
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Analysis
by VulDB Data Team • 10/12/2026
The vulnerability in question represents a critical authentication bypass within the OTRS ticketing system, specifically targeting the Agent Frontend configuration endpoint. This flaw allows unauthenticated remote actors to access sensitive internal application settings that are strictly intended for authenticated agents and administrators. The root cause lies in the improper implementation of access control mechanisms on this specific API or web interface path, which fails to enforce mandatory authentication checks before serving data. In a secure architecture, any request requiring privileged information must be validated against user credentials and session tokens prior to processing. Here, the absence of such validation creates an open channel for information disclosure, effectively turning a backend configuration resource into a publicly accessible endpoint. This misconfiguration is present across multiple versions of OTRS, including 8.0.X through 2026.X before version 2026.7.X, indicating a systemic issue in the framework's security model rather than an isolated incident.
The technical impact of this vulnerability extends beyond simple data exposure; it facilitates comprehensive reconnaissance and fingerprinting by potential attackers. By retrieving the internal configuration, an attacker gains insight into the specific architecture of the target installation. This includes detailed mappings of frontend routes coupled with their associated authorization groups, which reveals how permissions are structured within the organization's deployment. Furthermore, the exposed authentication configurations provide clues about supported identity providers, session management policies, and password complexity rules. Knowledge of enabled product features and third-party integration settings allows an attacker to identify potential attack vectors that rely on specific modules or external services connected to OTRS. This level of detail significantly reduces the effort required for subsequent phases of a cyber kill chain, such as vulnerability exploitation or lateral movement within the network.
From a classification perspective, this issue aligns with CWE-200: Exposure of Sensitive Information to an Unauthorized Actor and CWE-862: Missing Authorization. The failure to enforce access controls on a resource that requires authentication is a classic example of broken access control vulnerabilities often cited in OWASP Top 10 lists as Broken Access Control or Insecure Direct Object References depending on the specific implementation details. Additionally, this activity maps directly to MITRE ATT&CK technique T1592: Gather Victim Host Information and T1608: Install Defacement Tool if used for further compromise preparation. The disclosure of internal routes and authorization groups aids in mapping the application's logic, which is a precursor to techniques like T1190: Exploit Public-Facing Application or T1078: Valid Accounts if combined with credential stuffing based on exposed authentication policies.
The operational impact includes an increased risk profile for the entire organization hosting OTRS. While the vulnerability does not directly allow for remote code execution, data theft of customer tickets, or direct modification of system configurations, it serves as a powerful force multiplier for attackers. The information gathered can be used to craft targeted phishing campaigns against agents whose roles are revealed through authorization group mappings. It also aids in identifying weak points in third-party integrations that may have less robust security controls than the core OTRS application. For organizations relying on OTRS for critical service management, this exposure undermines trust and compliance with data protection regulations by revealing internal operational structures to external parties without consent or oversight.
Mitigation strategies must focus on immediate remediation through patching and interim defensive measures. The primary solution is to upgrade OTRS to version 2026.7.X or later where the authentication bypass has been addressed in the codebase. For systems that cannot be immediately patched, network-level controls should be implemented to restrict access to the affected endpoint. This can be achieved by configuring web application firewalls to block requests from unauthenticated sources to the specific configuration paths identified as vulnerable. Additionally, implementing strict IP whitelisting for administrative interfaces and ensuring that all internal APIs require valid session tokens or API keys is essential. Regular security audits of authentication flows across all endpoints are recommended to prevent similar misconfigurations in other parts of the application stack.