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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.

    Published:Feb 27, 2026
    Last Modified:Apr 17, 2026
    EPS:Feb 27, 2026
    EPSS Score:0.00058
    CVSS Score:7.5

    Affected Products

    Vendor
    Phpmyfaq
    Product
    Phpmyfaq
    Vendor
    Thorsten
    Product
    Phpmyfaq

    Exploits

    https://github.com/thorsten/phpMyFAQ/security/advisories/GHSA-w22q-m2fm-x9f4

    Common Weakness Enumeration

    CWE-862 Missing Authorization

    Common Attack Pattern Enumeration and Classification (CAPEC)

    CAPEC-665 Exploitation of Thunderbolt Protection Flaws

    Related CVEs

    CVE-2026-85593 (CVSS 5.1) — phpMyFAQ versions before 4.1.8 contain a stored cross-site scripting vulnerability in FaqHelper::convertOldInt…
    CVE-2026-85592 (CVSS 6.3) — phpMyFAQ before 4.1.8 contains an authorization bypass vulnerability in the question creation endpoint where t…
    CVE-2026-85591 (CVSS 7.1) — phpMyFAQ versions before 4.1.8 contain an authentication bypass vulnerability in the user control panel API en…
    CVE-2026-85590 (CVSS 7.1) — phpMyFAQ before 4.1.8 contains an authentication bypass vulnerability in its two-factor authentication (TOTP) …
    CVE-2026-85589 (CVSS 5.3) — phpMyFAQ before 4.2.0-alpha.2 contains a missing authorization vulnerability in the admin dashboard API endpoi…
    CVE-2026-85588 (CVSS 5.3) — phpMyFAQ versions before 4.1.8 include live TOTP shared secrets in plaintext within user data export ZIP files…
    CVE-2026-85587 (CVSS 5.3) — phpMyFAQ before 4.1.8 enforces incorrect permission checks on admin content pages, allowing lesser-privileged …
    CVE-2026-85586 (CVSS 6.9) — phpMyFAQ versions before 4.1.8 fail to validate CAPTCHA when the store parameter is set to 'now' in question s…
    CVE-2026-76215 (CVSS 6.9) — phpMyFAQ before 4.1.7 fails to apply parent FAQ visibility checks before returning child resources including c…
    CVE-2026-76214 (CVSS 9.1) — phpMyFAQ before 4.1.7 fails to persist the WebAuthn login challenge generated by prepareForLogin, because neit…

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High