CVE-2026-119561: phpMyAdmin through 5.2.3 contains an authentication bypass vulnerability in CustomServer::parseAndValidateAsse

Q: How do I fix CVE-2026-119561?

phpmyadmin: upgrade to newer than 5.2.3. Exact commands for each OS are on this page.

Q: Is CVE-2026-119561 being exploited?

CVE-2026-119561 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-119561 affect?

CVE-2026-119561 affects phpmyadmin. Severity is medium (CVSS 6.8). 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 c

Q: How urgent is CVE-2026-119561?

Priority 31/100. Public exploit reference

Routine

MEDIUM 6.8UPGRADE

CVE-2026-119561 is a medium-severity flaw (CVSS 6.8) affecting phpmyadmin. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	6.8 (Medium)
Attack vector	Network (remote)
Attack complexity	High
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.2% (top 92%)
CISA exploited list	No
Weakness	CWE-347
Published	2026-10-30
Last modified	2026-11-03

Publisher (CNA): VulnCheck · Vendor: phpmyadmin

Last updated 2026-11-03 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-10-30 12:16 UTCPublished CVE record published
2026-11-03 16:06 UTCUpdated Record last modified

phpmyadmin phpmyadmin UPGRADE

Affected: <= 5.2.3

Fixed in: newer than 5.2.3

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy phpmyadmin || rpm -q phpmyadmin || phpmyadmin --version

2. UPGRADE to newer than 5.2.3 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade phpmyadmin

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade phpmyadmin

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Advisories and coverage

Research and news

VulDB Recent Entries: CVE-2026-119561 | phpMyAdmin up to 5.2.3 WebAuthn CustomServer.php parseAndValidateAssertionResponse assertion 2026-10-30

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-119561?

phpmyadmin: upgrade to newer than 5.2.3. Exact commands for each OS are on this page.

Is CVE-2026-119561 being exploited?

CVE-2026-119561 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-119561 affect?

CVE-2026-119561 affects phpmyadmin. Severity is medium (CVSS 6.8). 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 c

How urgent is CVE-2026-119561?

Priority 31/100. Public exploit reference

Software pages

MySQL vulnerabilities · phpMyAdmin vulnerabilities

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References

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