SB2024071402 - Observable Response Discrepancy in Webauthn Framework
Published: July 14, 2024 Updated: April 28, 2026
Security Bulletin ID
SB2024071402
CSH Severity
Medium
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Remote access
Highest impact
Information disclosure
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 security vulnerability.
1) Observable Response Discrepancy (CVE-ID: CVE-2024-39912)
The vulnerability allows a remote attacker to enumerate valid usernames.
The vulnerability exists due to observable response discrepancy in ProfileBasedRequestOptionsBuilder when handling assertion options requests with a supplied username. A remote attacker can send a specially crafted request to enumerate valid usernames.
The issue is exposed when WebAuthn is used as the first or only authentication method.
Remediation
Install update from vendor's website.