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CVE-2026-27836

phpMyFAQ is an open source FAQ web application. Prior to version 4.0.18, the WebAuthn prepare endpoint (`/api/webauthn/prepare`) creates new active user accounts without any authentication, CSRF protection, captcha, or configuration checks. This allows unauthenticated attackers to create unlimited user accounts even when registration is disabled. Version 4.0.18 fixes the issue.
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:11c139691999882a21d2a9631df87b7c46069651a2cf985b3dc5cbee8e11c8c0
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
0

Affected products and versions

1 source assertion
{"product":"phpMyFAQ","vendor":"thorsten","versions":[{"status":"affected","version":"< 4.0.18"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:3e4c681edd45b2711e30e54b647ec05959a94843a730cd47c7cbaea81aff20ad · sha256:0fcf3ea9802ed1a6… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":7.5,"baseSeverity":"HIGH","confidentialityImpact":"NONE","integrityImpact":"HIGH","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:3e4c681edd45b2711e30e54b647ec05959a94843a730cd47c7cbaea81aff20ad · sha256:0fcf3ea9802ed1a6… · /containers/cna/metrics/0/cvssV3_1

CWE assertions

1 source assertion
{"cweId":"CWE-862","description":"CWE-862: Missing Authorization","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:3e4c681edd45b2711e30e54b647ec05959a94843a730cd47c7cbaea81aff20ad · sha256:0fcf3ea9802ed1a6… · /containers/cna/problemTypes/0/descriptions/0

Source references

2 source assertions
{"name":"https://github.com/thorsten/phpMyFAQ/commit/f2ab673f0668753cd0f7c7c8bc7fd2304dcf5cb1","tags":["x_refsource_MISC"],"url":"https://github.com/thorsten/phpMyFAQ/commit/f2ab673f0668753cd0f7c7c8bc7fd2304dcf5cb1"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:3e4c681edd45b2711e30e54b647ec05959a94843a730cd47c7cbaea81aff20ad · sha256:0fcf3ea9802ed1a6… · /containers/cna/references/1
{"name":"https://github.com/thorsten/phpMyFAQ/security/advisories/GHSA-w22q-m2fm-x9f4","tags":["x_refsource_CONFIRM"],"url":"https://github.com/thorsten/phpMyFAQ/security/advisories/GHSA-w22q-m2fm-x9f4"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:3e4c681edd45b2711e30e54b647ec05959a94843a730cd47c7cbaea81aff20ad · sha256:0fcf3ea9802ed1a6… · /containers/cna/references/0

Attribution and limitations

  • CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →

Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.

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