Origin validation error in Webauthn Framework - CVE-2026-30964
Published: April 28, 2026
Vulnerability identifier: #VU128268
CSH Severity: Medium
CVSS v4: 5.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-30964
CWE-ID: CWE-346
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
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.
Affected software
Webauthn Framework
Fedora
nextcloud
Fedora
nextcloud
How to mitigate CVE-2026-30964
Install security update from vendor's website.
Webauthn Framework - update to 5.2.4
nextcloud - addressed in versions 33.0.1-1.el10_1, 33.0.1-1.fc42
nextcloud - addressed in versions 33.0.1-1.el10_1, 33.0.1-1.fc42