SB2026042823 - Origin validation error in Webauthn Framework
Published: April 28, 2026
Security Bulletin ID
SB2026042823
CSH Severity
Medium
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Remote access
Highest impact
Data manipulation
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 security vulnerability.
1) Origin validation error (CVE-ID: CVE-2026-30964)
The vulnerability allows a remote attacker to bypass exact origin validation.
The vulnerability exists due to an origin validation error in CheckAllowedOrigins when processing configured allowed origins and clientDataJSON.origin values. A remote attacker can supply a crafted origin value to bypass exact origin validation.
User interaction is required, and the issue affects deployments that use the allowed_origins feature.
Remediation
Install update from vendor's website.