phpMyAdmin through 5.2.3 WebAuthn Two-Factor Authentication Bypass via CustomServer
- Last modified
- Where the record stands: published, rejected by its publisher, or superseded by another id.What do these mean? →
- published
- Whether CISA lists it in its Known Exploited Vulnerabilities catalog: proof that attackers are using it.What do these mean? →
- Not listed in CISA KEV
- How many real-world setups can hit the bug, from the vendor's advisory and CISA data. It does not know your setup.What do these mean? →
- Specific setups only
- Whether working attack code is public (Exploit-DB, Metasploit, Nuclei or GitHub). Public code makes attacks easier.What do these mean? →
- None on Exploit-DB, Metasploit or GitHub
- Exploitation: none
- Automatable: no
- Technical impact: total
Summary
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.
Timeline
- CVE published
- First seen by cve.now
- CISA SSVC assessment
Exploitation: none · Automatable: no · Technical impact: total
- Record last updated
Affected versions
- phpMyAdmin phpMyAdmin
through 5.2.3
References 5
GitHub · phpmyadmin/phpmyadmin
abraxaslabs.tech
Questions about CVE-2026-119561
What does this mean?
A flaw in phpMyAdmin's WebAuthn two-factor login lets an attacker who already knows the MySQL password forge a second-factor assertion and get a full phpMyAdmin session without the second factor.Source: abraxaslabs.tech
Am I affected, and how do I check?
The facts list phpMyAdmin through 5.2.3 as affected, specifically the default tarball where the optional web-auth/webauthn-lib package is absent so the CustomServer path is used. To check, look for whether that package is installed in the phpMyAdmin setup and which version is in use.Source: abraxaslabs.tech
What should I do about it?
No vendor fix version is listed yet, so there is no upgrade target in the facts. Watch the phpMyAdmin project for an assigned patch.Source: abraxaslabs.tech
Is it being exploited?
It is not in CISA's Known Exploited Vulnerabilities catalog, and CISA's SSVC assessment does not mark exploitation as active. That does not mean it has not been attacked: vendors and researchers can report attacks before CISA lists them. No public exploit code is tracked.Source: cve.now feed data
What if there's no patch?
Install web-auth/webauthn-lib so the library is used instead of CustomServer, or disable WebAuthn two-factor authentication, or stop exposing this phpMyAdmin instance.Source: abraxaslabs.tech