CVE-2026-92720 in Kubero
Summary
by MITRE • 09/16/2026
Kubero through 3.1.1 fails to apply authentication guards to the notifications API endpoints, allowing unauthenticated attackers to read webhook secrets and service URLs. Attackers can retrieve stored credentials and register malicious webhooks to intercept pipeline events or suppress alerting by deleting existing configurations.
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Analysis
by VulDB Data Team • 09/16/2026
The vulnerability identified in Kubero versions through 3.1.1 represents a critical failure in access control mechanisms within the application's notification subsystem. Specifically, the authentication guards that are intended to restrict access to sensitive configuration endpoints were not properly applied to the notifications API routes. This misconfiguration results in these endpoints being publicly accessible without requiring valid credentials or session tokens from the requesting client. In modern web applications and container orchestration platforms like Kubero, which often handle sensitive integration data such as webhook secrets and service URLs, ensuring that only authorized administrators can view or modify this information is paramount for maintaining system integrity. The absence of these authentication checks effectively exposes internal configuration details to any actor with network reachability to the application interface, fundamentally breaking the principle of least privilege.
From a technical perspective, the flaw allows unauthenticated attackers to perform read operations on endpoints that store webhook secrets and service URLs. Webhook secrets are typically used as shared keys or tokens to verify the authenticity of incoming requests from external services, while service URLs define where these notifications should be delivered. By retrieving stored credentials via these unprotected endpoints, an attacker gains insight into the communication channels established by the platform. This information is highly valuable for subsequent attack phases, as it enables the adversary to craft legitimate-looking payloads or manipulate existing integrations. The vulnerability essentially turns a management interface intended for administrative use into an open data source for sensitive operational metadata.
The operational impact of this vulnerability extends beyond simple information disclosure. Once an attacker has retrieved webhook secrets and service URLs, they can register malicious webhooks to intercept pipeline events. This capability allows the adversary to monitor continuous integration or deployment activities in real-time, potentially stealing build artifacts, environment variables, or source code snippets transmitted during these processes. Furthermore, the ability to delete existing notification configurations provides a destructive vector for denial of service against alerting mechanisms. By suppressing alerts, attackers can blind security operations teams and system administrators to ongoing malicious activity, such as unauthorized deployments, resource exfiltration, or infrastructure compromise. This suppression capability significantly increases the window of exposure and reduces the likelihood of timely incident response.
This vulnerability aligns with CWE-284 Improper Access Control, specifically reflecting a failure to enforce authentication on sensitive API endpoints. It also maps closely to MITRE ATT&CK technique T1505.003 Server Message Block (SMB) Events if considering the broader context of event interception, but more accurately relates to T1190 Exploit Public-Facing Application and T1530 Data from Cloud Storage Object Discovery when viewed through the lens of accessing stored secrets. The ability to register malicious webhooks corresponds to data injection techniques that allow for persistent monitoring or manipulation of system events. These mappings highlight the severity of the issue, as it facilitates both reconnaissance and active exploitation phases within a cyber kill chain.
Mitigation strategies must prioritize immediate remediation by upgrading Kubero to version 3.1.2 or later where these authentication guards have been correctly implemented. In environments where an upgrade is not immediately feasible, network-level controls should be employed to restrict access to the notifications API endpoints exclusively from trusted administrative IP addresses using firewall rules or reverse proxy configurations. Additionally, organizations should rotate all exposed webhook secrets and service URLs as a precautionary measure, assuming that they may have been compromised during the period of vulnerability exposure. Regular audits of API endpoint permissions are recommended to ensure that authentication requirements remain consistent across all application modules, preventing similar misconfigurations in future releases or custom integrations.