Executive Summary

CVE-2026-7165 is a critical vulnerability in the '/addJugador' endpoint of the Assassin game by Gaudire.

• The 'keyJugador' and 'keyJugadorObjectiu' parameters allow an authenticated attacker to modify other users' information without authorization.
• The 'punts' and 'numObjectiusEliminats' fields lack proper input validation, enabling falsification of game scores to obtain prizes.
• The 'tokens' field allows self-assignment of administrative privileges without server validation, leading to privilege escalation.
• Numeric fields accept extremely long values, which can crash the system and cause denial-of-service (DoS).
• The 'urlImatge' parameter permits server-side requests to arbitrary URLs, exposing internal IPs, internal services, local files, and unauthorized third-party API interactions.

Overall, this vulnerability allows attackers to alter user data, escalate privileges, falsify scores, cause system crashes, and access sensitive internal information.

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Impact Analysis

This vulnerability can have severe impacts including:

• Unauthorized modification of user information, compromising data integrity.
• Falsification of game scores to illegitimately obtain prizes awarded by city councils.
• Privilege escalation by self-assigning administrative rights, potentially leading to full system control.
• Denial-of-service attacks by crashing the system with excessively long numeric inputs, disrupting game availability.
• Exposure of sensitive data through server-side requests to arbitrary URLs, including internal IP addresses and files.

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Detection Guidance

Detection of this vulnerability involves monitoring and testing the '/addJugador' endpoint for unauthorized modifications and improper input handling.

• Check if the 'keyJugador' and 'keyJugadorObjectiu' parameters allow modification of other users' information without authorization.
• Test the 'punts' and 'numObjectiusEliminats' fields by submitting arbitrary or malformed data to see if input validation is enforced.
• Attempt to assign administrative privileges via the 'tokens' field without proper authentication.
• Submit extremely long numeric values to numeric fields to check for system crashes or denial-of-service conditions.
• Use the 'urlImatge' parameter to send server-side requests to arbitrary URLs and observe if internal IP addresses or local files can be accessed.

Specific commands are not provided in the available resources.

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Mitigation Strategies

There is no reported solution or patch available at this time to mitigate the vulnerability.

Immediate mitigation steps would typically include restricting access to the '/addJugador' endpoint to trusted users only and monitoring for suspicious activity.

Implementing additional authorization checks and input validation on the server side is recommended once a fix is available.

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Compliance Impact

This vulnerability allows unauthorized modification of user information, privilege escalation, and unauthorized access to sensitive data. Such issues can lead to violations of data protection regulations like GDPR and HIPAA, which require strict controls over personal data access, integrity, and confidentiality.

Specifically, the ability to alter user IDs and information without authorization, self-assign administrative privileges, and access internal services and sensitive data could result in non-compliance with requirements for user consent, data integrity, and access controls mandated by these standards.

Additionally, the potential for denial-of-service attacks could impact availability requirements under these regulations.

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