Bug 2565558

Summary: CVE-2026-119561 phpMyAdmin: phpMyAdmin: Two-factor authentication bypass via unverified WebAuthn signatures [fedora-rawhide]
Product: [Fedora] Fedora Reporter: Ganesh <gnaik>
Component: phpMyAdminAssignee: Robert Scheck <redhat-bugzilla>
Status: NEW --- QA Contact: Fedora Extras Quality Assurance <extras-qa>
Severity: medium Docs Contact:
Priority: medium    
Version: rawhideCC: fedora, imlinux+fedora, redhat-bugzilla, williamdes
Target Milestone: ---Keywords: Security, SecurityTracking
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Hardware: Unspecified   
OS: Unspecified   
Whiteboard: {"flaws": ["e84c057a-66a4-4699-9fb5-5e6e4efe4873"]}
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
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Bug Depends On:    
Bug Blocks: 2563944    

Description Ganesh 2026-11-03 02:49:08 UTC 
Disclaimer: Community trackers are created by Red Hat Product Security team on a best effort basis. Package maintainers are required to ascertain if the flaw indeed affects their package, before starting the update process.

phpMyAdmin through 5.2.3 contains an authentication bypass vulnerability in CustomServer::parseAndValidateAssertionResponse() that never verifies WebAuthn assertion signatures against stored public keys. Attackers holding a victim's MySQL credentials can POST a crafted webauthn_request_response with matching challenge, origin, and rpIdHash to bypass the second factor and gain database privileges.