CVE-2026-71626 in Ninja
Summary
by MITRE • 09/04/2026
An issue in Invoice Ninja v5.13.24 allows a remote attacker to obtain sensitive information via the StoreWebhookRequest.php, UpdateWebhookRequest.php, and WebhookSingle.php components
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Analysis
by VulDB Data Team • 09/04/2026
The vulnerability identified within Invoice Ninja versions prior to 5.13.25 represents a significant security flaw affecting the application's webhook management subsystem. This issue stems from improper access control mechanisms embedded in several core PHP request handler files, specifically StoreWebhookRequest.php, UpdateWebhookRequest.php, and WebhookSingle.php. These components are responsible for creating new webhooks, modifying existing ones, and executing single webhook dispatches respectively. In the affected versions, these endpoints fail to adequately verify that the authenticated user initiating the action possesses administrative privileges or appropriate ownership rights over the specific entity being modified. This oversight allows a remote attacker who has obtained valid credentials for any standard account on the system to bypass intended restrictions and interact with sensitive configuration data.
From a technical perspective, the root cause lies in the middleware or authorization logic that precedes these controller actions. Typically, such systems rely on role-based access control checks to ensure that only users with elevated permissions can manage global settings like webhooks, which often contain secrets used for integrating with third-party services. In this case, the validation logic is either missing or incorrectly implemented, allowing a lower-privileged user to send requests to these endpoints as if they were an administrator. This constitutes a classic broken access control vulnerability where the application fails to enforce proper separation of duties between different user roles. The attacker can leverage this flaw to view webhook configurations that may include sensitive data such as API keys, secret tokens, or endpoint URLs intended for secure internal services.
The operational impact of this vulnerability is severe due to the nature of webhooks in modern software architectures. Webhooks are frequently used to transmit real-time notifications and data payloads between Invoice Ninja and external systems like accounting platforms, CRM tools, or payment gateways. By exploiting this flaw, an attacker can extract sensitive configuration details that serve as authentication credentials for these integrations. Possession of such secrets allows the adversary to impersonate the application in communications with third-party services, potentially leading to unauthorized data exfiltration, manipulation of financial records, or further compromise of connected systems. Furthermore, if the webhooks are configured to send data containing customer personally identifiable information, this exposure directly violates privacy regulations and compromises client confidentiality.
This vulnerability aligns closely with CWE-269, which describes Improper Privilege Assignment, as it involves a user operating outside their designated permission level. It also maps to MITRE ATT&CK technique T1078, Valid Accounts, specifically in the context of using legitimate credentials to access resources not intended for that account type. The ability to read sensitive configuration data without proper authorization is further categorized under CWE-200, Exposure of Sensitive Information to an Unauthorized Actor. These classifications highlight the critical need for strict enforcement of role-based permissions on all administrative endpoints within enterprise applications.
To mitigate this risk, organizations running Invoice Ninja must immediately upgrade to version 5.13.25 or later, where these access control checks have been corrected. Until the update is applied, administrators should monitor logs for unusual activity related to webhook creation and modification by non-admin users. It is also advisable to rotate any API keys or secrets associated with webhooks that may have been exposed during the window of vulnerability. Implementing additional network-level controls, such as restricting access to internal services via IP whitelisting where possible, can provide a layer of defense in depth against potential exploitation of stolen webhook credentials. Regular security audits and penetration testing focused on authorization bypasses are recommended to ensure similar flaws do not exist elsewhere in the application logic.