CVE-2025-54599
📋 TL;DR
This CVE describes an account takeover vulnerability in the Bevy Event service when SSO is used. Attackers can hijack victim accounts by exploiting SSO misconfiguration after victims change their configured email addresses. This affects all users of Bevy Event service through July 22, 2025, particularly those using SSO authentication.
💻 Affected Systems
- Bevy Event service
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete account takeover allowing attackers to impersonate victims, access sensitive event data, modify event configurations, and potentially compromise associated accounts through SSO federation.
Likely Case
Unauthorized access to victim's Bevy Event account, enabling manipulation of event settings, registration data, and potentially exposing personal information of event attendees.
If Mitigated
Limited impact with proper SSO configuration validation and email change verification processes in place.
🎯 Exploit Status
Exploitation requires attacker to have their own account and perform SSO login. Public proof-of-concept exists in GitHub gist and YouTube video references.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: https://bevy.com/b/events-and-groups
Restart Required: No
Instructions:
1. Contact Bevy support for updated SSO configuration guidance. 2. Review and correct SSO configuration settings. 3. Implement proper email change verification processes.
🔧 Temporary Workarounds
Disable SSO temporarily
allTemporarily disable SSO authentication until proper configuration can be implemented
Implement email change verification
allAdd multi-factor verification for email address changes in SSO configurations
🧯 If You Can't Patch
- Monitor user accounts for suspicious email change activities
- Implement additional authentication factors for sensitive account operations
🔍 How to Verify
Check if Vulnerable:
Test SSO configuration by attempting to change email address and observing if proper verification occurs. Check if SSO tokens are properly invalidated during email changes.Check Version:
Check Bevy Event service configuration date - vulnerable if configured before 2025-07-22Verify Fix Applied:
Verify that email address changes now require proper authentication and SSO token revalidation. Test that attackers cannot link their SSO to victim accounts after email changes.📡 Detection & Monitoring
Log Indicators:
- Multiple SSO login attempts from different IPs for same account
- Email change events followed by SSO authentication from new locations
- Account takeover patterns in authentication logs
Network Indicators:
- Unusual SSO token exchange patterns
- Multiple authentication requests for single user session
SIEM Query:
source="bevy_logs" AND (event="email_change" OR event="sso_auth") | stats count by user, src_ip | where count > threshold