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CVE-2026-119561high7.6

phpMyAdmin through 5.2.3 WebAuthn Two-Factor Authentication Bypass via CustomServer

Impact

phpMyAdmin through 5.2.3 has an authentication bypass vulnerability. Attackers with MySQL credentials can bypass two-factor authentication by posting a crafted request. This is due to a weakness in verifying WebAuthn assertion signatures.

Summarized by @cf/meta/llama-3.3-70b-instruct-fp8-fast. Verify details against the original sources.

Affected packages

This source has no supported package-version data for matching. You can read the advisory here, but this record alone cannot power a dependency check.

Affected products

Vendor version evidence. Product records are separate from automatic dependency matching.

phpMyAdmin · VulnCheck

phpMyAdmin

1 range
VulnCheck version evidence

Package identity

pkg:composer/phpmyadmin/phpmyadminExplore phpmyadmin/phpmyadmin →

Identity supplied by VulnCheck. Version matching requires compatible range evidence.

Compare with this publisher’s ranges. This does not inspect your installation.

affected

0 → through 5.2.3

semver versions

unaffected

unknown

Other versions: unaffected

Original source description

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.

Inside the record

Evidence available

Package identity
Version evidence
Remediation guidance · not supplied
Weakness classification
Additional publishers

Describes the evidence in this view, not whether the product is safe.

Original records

CVE-2026-119561

View the latest unmodified CVE JSON from the official source. It may be newer than this imported page.

cve.new JSON →

Underlying weaknesses

The source’s classification of what caused the vulnerability.

CWE-347 ↗

Improper Verification of Cryptographic Signature

VulnCheck

Related →

Environment requirements

These conditions apply together as specified by the publisher. A matching product name alone does not establish exposure.

VulnCheck · platform conditions

Any condition may hold

Vulnerable product

cpe:2.3:a:phpmyadmin:phpmyadmin:*:*:*:*:*:*:*:*

Through (inclusive): 5.2.3

Original applicability statements
[
  {
    "nodes": [
      {
        "operator": "OR",
        "negate": false,
        "cpeMatch": [
          {
            "vulnerable": true,
            "criteria": "cpe:2.3:a:phpmyadmin:phpmyadmin:*:*:*:*:*:*:*:*",
            "versionEndIncluding": "5.2.3"
          }
        ]
      }
    ]
  }
]
Contributing organizations · 2
VulnCheck

Assigning organization

2026-10-30
CISA-ADP

Additional data publisher

2026-10-30

What changed

Follow changes
  1. CVE · CVE-2026-119561

    Observed 2026-10-30T17:27:05.873Z · upstream updated 2026-10-30T16:21:29.456Z

    Prioritization updated

    before

    []

    after

    [
  {
    "source": "CISA-ADP",
    "type": "SSVC",
    "role": "CISA Coordinator",
    "timestamp": "2026-10-30T16:21:10.400395Z",
    "decisions": [
      {
        "name": "Exploitation",
        "value": "none"
      },
      {
        "name": "Automatable",
        "value": "no"
      },
      {
        "name": "Technical Impact",
        "value": "total"
      }
    ]
  }
]

Large field values are marked as truncated previews. Original source snapshots remain retained.

Showing up to 50 most recent observed changes.

References

5 sources
github.com/phpmyadmin/phpmyadmin/blob/RELEASE_5_2_3/libraries/classes/WebAuthn/CustomServer.php
technical-descriptionVulnCheck
abraxaslabs.tech/research/PMA-5.2.3-WebAuthn-2FA
third-party-advisoryVulnCheck
abraxaslabs.tech/research/phpmyadmin-webauthn
third-party-advisoryVulnCheck
github.com/phpmyadmin/phpmyadmin
productVulnCheck
www.vulncheck.com/advisories/phpmyadmin-through-5.2.3-webauthn-two-factor-authentication-bypass-via-customserver
third-party-advisoryVulnCheck