CVE-2026-76207 Overview
CVE-2026-76207 is a two-factor authentication (2FA) bypass vulnerability in phpMyFAQ, an open-source FAQ management system written in PHP. Versions prior to 4.1.7 issue remember-me tokens before the 2FA challenge completes. An attacker who already knows valid primary credentials can capture the remember-me cookie during the login flow and replay it to obtain a fully authenticated session without ever satisfying the second factor. The flaw is classified as [CWE-304: Missing Critical Step in Authentication].
Critical Impact
Attackers with valid usernames and passwords can bypass 2FA entirely by replaying the remember-me cookie, defeating the protection that 2FA is meant to provide against credential theft.
Affected Products
- phpMyFAQ versions prior to 4.1.7
- Deployments with 2FA and remember-me functionality enabled
- Self-hosted phpMyFAQ installations exposed to the network
Discovery Timeline
- 2026-08-19 - CVE-2026-76207 published to NVD
- 2026-08-19 - Last updated in NVD database
Technical Details for CVE-2026-76207
Vulnerability Analysis
phpMyFAQ implements a two-step authentication workflow. The first step validates the username and password. The second step requires the user to submit a valid time-based one-time password (TOTP) when 2FA is enabled on the account. The remember-me feature issues a persistent cookie so returning users skip the login form on future visits.
The defect is an ordering error in the authentication state machine. The application generates and sets the remember-me token immediately after the password check succeeds, before the 2FA challenge is evaluated. As a result, the persistent token is bound only to primary credential validation, not to full multi-factor authentication.
An attacker who captures the cookie, whether through phishing, credential reuse, malware, or an intermediate proxy, can present the token on a fresh session. The server treats the remember-me cookie as sufficient proof of identity and grants access without prompting for the TOTP code.
Root Cause
The root cause is a missing critical authentication step [CWE-304]. The session issuance logic executes on password success rather than on completion of the full authentication ceremony. The remember-me token therefore represents a partially authenticated state and grants privileges reserved for fully authenticated sessions.
Attack Vector
Exploitation is network-based and requires low privileges: the attacker must possess valid primary credentials or capture a remember-me cookie in transit or at rest. No user interaction is required for the replay step. The attacker submits the cookie to the phpMyFAQ endpoint and receives an authenticated session that bypasses the TOTP challenge. See the phpMyFAQ GitHub Security Advisory and the VulnCheck Advisory for additional detail.
No verified public exploit code is available. The vulnerability mechanism is described in the referenced advisories.
Detection Methods for CVE-2026-76207
Indicators of Compromise
- Successful authenticated sessions on phpMyFAQ accounts with 2FA enabled that lack a corresponding TOTP verification event in the application log.
- Remember-me cookie presentation from IP addresses or user agents that never completed a full login and 2FA challenge on the server.
- Session establishment events that skip the /2fa or equivalent verification endpoint for accounts configured with a second factor.
Detection Strategies
- Correlate authentication logs to flag sessions where a remember-me token is honored without a preceding 2FA success event for the same account.
- Alert on privileged administrative actions performed from sessions established via remember-me cookie replay from new geolocations or devices.
- Hunt for reuse of remember-me tokens across multiple client fingerprints within short time windows.
Monitoring Recommendations
- Enable verbose authentication logging in phpMyFAQ and forward events to a centralized SIEM or data lake.
- Track baseline 2FA completion rates per account and alert on anomalous drops that could indicate bypass.
- Monitor outbound web traffic from phpMyFAQ hosts for indicators of post-authentication abuse such as bulk data export.
How to Mitigate CVE-2026-76207
Immediate Actions Required
- Upgrade phpMyFAQ to version 4.1.7 or later on all instances.
- Invalidate all existing remember-me tokens and force re-authentication for every user.
- Rotate session secrets and any signing keys used for persistent cookies.
- Audit administrative accounts for unauthorized actions performed since 2FA was enabled.
Patch Information
The issue is fixed in phpMyFAQ 4.1.7. Refer to the phpMyFAQ GitHub Security Advisory GHSA-hvj7-4fmg-53cr for the official release notes and patch details. The fix defers remember-me token issuance until after successful 2FA verification.
Workarounds
- Disable the remember-me feature in phpMyFAQ configuration until the upgrade is applied.
- Require users with 2FA enabled to authenticate through the full login flow on every visit.
- Restrict phpMyFAQ administrative endpoints to trusted network ranges or VPN clients while patching is scheduled.
- Reduce the lifetime of persistent authentication cookies to the shortest value acceptable for the deployment.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
