Improper Authentication in waooAI waoowaoo

Executive Summary

CVE-2026-15557 is an authentication bypass vulnerability in the waooAI waoowaoo platform up to version 0.4.1. The issue occurs because the application improperly trusts certain internal request headers, such as `x-internal-user-id` and `x-internal-task-token`, to create authenticated sessions.

An attacker can exploit this by sending manipulated headers with a known default or public token (often found in default configurations) along with any arbitrary user ID. This allows the attacker to impersonate any user without proper authentication.

The root cause is insufficient validation of session identity keys and exposure of internal task headers to external clients, leading to improper authentication.

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Detection Guidance

This vulnerability can be detected by checking if your system or network is accepting and trusting the headers `x-internal-user-id` and `x-internal-task-token` from external requests. Specifically, you should verify if the default or public tokens shipped with the software (such as those in `docker-compose.yml` or `.env.example`) are still in use, as these allow attackers to impersonate any user.

You can inspect incoming HTTP requests to see if these headers are present and whether they are being accepted without proper validation.

• Use network traffic monitoring tools like tcpdump or Wireshark to capture HTTP requests and filter for the headers `x-internal-user-id` and `x-internal-task-token`.
• Run commands such as: `curl -v -H "x-internal-user-id: test" -H "x-internal-task-token: <token>" http://your-waoowaoo-instance/api` to test if the server accepts these headers and grants access.
• Check your deployment files for default tokens by inspecting `docker-compose.yml` or `.env.example` files for token values.

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Impact Analysis

This vulnerability can allow an attacker to bypass authentication and impersonate any user on the waooAI waoowaoo platform.

• Unauthorized access to sensitive user data.
• Access to project information that should be restricted.
• Unauthorized use of API functionalities.

The risk is especially high in non-production environments or default deployments where tokens are unset or unchanged, making exploitation easier.

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Compliance Impact

This vulnerability can significantly impact compliance with standards and regulations such as GDPR and HIPAA due to its potential to expose sensitive user data and enable unauthorized access.

• GDPR: The vulnerability allows attackers to impersonate users and access their personal data without proper authentication. Under GDPR, this constitutes a breach of data protection principles, particularly the requirement for lawful processing (Article 5) and the implementation of appropriate security measures (Article 32). Unauthorized access to personal data could lead to violations of individuals' rights, such as the right to access (Article 15) or the right to erasure (Article 17), and may trigger mandatory breach notifications (Article 33).
• HIPAA: If the affected system processes or stores protected health information (PHI), this vulnerability could lead to unauthorized access to PHI, violating the HIPAA Privacy Rule (45 CFR Part 164, Subpart E) and Security Rule (45 CFR Part 164, Subpart C). The improper authentication mechanism fails to meet HIPAA's requirements for access controls (164.312(a)(1)) and authentication (164.312(d)), potentially resulting in data breaches and non-compliance penalties.
• General impact: The exposure of sensitive data due to this vulnerability could also affect compliance with other regulations, such as the California Consumer Privacy Act (CCPA) or industry-specific standards like PCI DSS if payment information is involved. Organizations using the affected software may face legal consequences, reputational damage, and financial penalties for failing to protect user data adequately.

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Mitigation Strategies

Immediate mitigation steps include enforcing strong token requirements and rejecting any default or public tokens that come with the software.

You should separate internal-worker identities from end-user identities to prevent misuse of internal headers.

Additionally, configure your proxy or gateway to strip out the `x-internal-user-id` and `x-internal-task-token` headers from any external requests to prevent attackers from injecting them.

Review and update your deployment configurations to ensure no default tokens remain active.

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