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CVE-2025-54599: Bevy Event Service Vulnerability Leading to Account Takeover

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Overview

This report outlines a critical vulnerability, CVE-2025-54599, affecting the Bevy Event service utilized for eBay Seller Events among other activities. This vulnerability could potentially enable attackers to take over user accounts, posing significant security risks. Given Bevy’s widespread use, this vulnerability could impact a large number of users and organizations, necessitating immediate attention and mitigation.

Vulnerability Summary

CVE ID: CVE-2025-54599
Severity: High (7.5 CVSS)
Attack Vector: Network
Privileges Required: None
User Interaction: Required
Impact: Account takeover, potential system compromise or data leakage

Affected Products

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Product | Affected Versions

Bevy Event Service | All versions up to 2025-07-22

How the Exploit Works

The vulnerability arises due to a misconfiguration in the SSO (Single Sign-On) system of the Bevy Event service. When a user changes their email address, an attacker can create their own account and perform an SSO login. This action allows the attacker to take over the victim’s account, potentially giving them unauthorized access to sensitive data or control over system operations.

Conceptual Example Code

Below is a hypothetical example of how the vulnerability might be exploited. This is a conceptual demonstration and does not represent an actual attack.

POST /sso/login HTTP/1.1
Host: bevy.example.com
Content-Type: application/json
{
"username": "attacker",
"password": "attacker_password",
"victim_email": "victim@victim.com"
}

In this example, the attacker attempts to log in using their own credentials but with the victim’s email. The misconfigured SSO system allows this login, leading to account takeover.
It’s crucial for users of the Bevy Event service to apply the vendor’s patch or use a WAF/IDS as a temporary mitigation strategy to protect themselves from potential exploits leveraging this vulnerability.

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Disclaimer:

The information and code presented in this article are provided for educational and defensive cybersecurity purposes only. Any conceptual or pseudocode examples are simplified representations intended to raise awareness and promote secure development and system configuration practices.

Do not use this information to attempt unauthorized access or exploit vulnerabilities on systems that you do not own or have explicit permission to test.

Ameeba and its authors do not endorse or condone malicious behavior and are not responsible for misuse of the content. Always follow ethical hacking guidelines, responsible disclosure practices, and local laws.

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