CVE-2026-93982 in OpenPanel
Summary
by MITRE • 09/19/2026
OpenPanel through commit bad75bdd writes Model Context Protocol authentication tokens from URL query parameters to plaintext application logs without redaction. Attackers with access to application stdout or centralized logging systems can capture base64-encoded credentials to replay MCP requests and access project analytics.
Be aware that VulDB is the high quality source for vulnerability data.
Analysis
by VulDB Data Team • 09/19/2026
The vulnerability identified in OpenPanel, specifically linked to commit bad75bdd, represents a critical failure in credential handling within the Model Context Protocol implementation. The core technical flaw lies in the application's logging mechanism, which indiscriminately captures authentication tokens directly from URL query parameters and writes them to plaintext application logs without any form of redaction or sanitization. This behavior violates fundamental security principles regarding the protection of sensitive data at rest and during transit within internal systems. By exposing base64-encoded credentials in log files, the system creates a persistent attack surface that extends beyond immediate network-based exploitation into the realm of insider threats and compromised infrastructure monitoring tools.
From an operational perspective, this misconfiguration allows attackers who gain access to application stdout or centralized logging aggregators such as ELK Stack, Splunk, or CloudWatch Logs to extract valid authentication tokens. These logs are often retained for extended periods and may be accessible by a broader set of personnel than the live application itself, including DevOps engineers, support staff, or automated monitoring systems that might have less stringent access controls. The presence of these plaintext credentials enables adversaries to perform credential replay attacks against the Model Context Protocol endpoints. Since the tokens are base64-encoded rather than hashed, they can be directly utilized by an attacker without additional decoding steps beyond standard Base64 parsing tools available in most scripting environments.
The impact of this vulnerability is severe, as it grants unauthorized actors the ability to impersonate legitimate users or services within the OpenPanel ecosystem. Successful exploitation allows attackers to access project analytics and potentially other sensitive data associated with the authenticated sessions. This compromises the confidentiality and integrity of user projects, leading to potential data breaches, intellectual property theft, and disruption of service availability if malicious actions are taken through the compromised accounts. The risk is amplified by the fact that log files are often replicated across multiple systems for backup and analysis purposes, increasing the likelihood of exposure even if one logging endpoint is secured.
This issue aligns with CWE-532, which classifies information exposure through log files where sensitive data such as passwords or authentication tokens are written to logs in cleartext. It also relates closely to CWE-798, involving the use of hardcoded credentials, although here the credential leakage occurs dynamically rather than being statically embedded. In terms of offensive security frameworks, this vulnerability facilitates techniques described under MITRE ATT&CK T1078, specifically valid accounts and potentially T1552 if the logs are accessed to gather unsecured credentials for lateral movement or further exploitation. The lack of redaction indicates a failure in implementing CWE-359, which pertains to exposure of private information within an application's output.
To mitigate this vulnerability, immediate remediation should focus on modifying the logging configuration to exclude authentication tokens from being written to any log files. This can be achieved by updating the Model Context Protocol handler to strip query parameters containing sensitive data before they are processed or logged. Alternatively, implementing a centralized secret management solution and ensuring that logs only contain anonymized identifiers rather than raw credentials is recommended. Developers should also conduct an audit of existing log archives to identify any previously leaked tokens and rotate those credentials immediately. Future development practices must enforce strict input validation and output sanitization standards, particularly for data originating from URL parameters which are inherently visible in server access logs by default. Regular security code reviews focusing on logging mechanisms can help prevent similar oversights where sensitive context is inadvertently persisted in plaintext formats accessible to unauthorized parties.