Vigilant Plugin Bypasses Two-Factor Authentication on Alternative Login Forms

The Vigilant WordPress plugin before 2.11.0 does not enforce its two-factor authentication on login forms other than the default WordPress one, allowing an attacker who knows a user's password to skip the second factor and log in as that user.

Casky was already ahead

This CVE exploits attack patterns that Casky's 283matched skills already investigate — long before this vulnerability was disclosed. Claude's reasoning model maps these techniques to MITRE ATT&CK, so practitioners who ran these skills have already seen the threat behaviour in their findings.

Analysis

The Vigilant WordPress plugin vulnerability (CVE-2026-123091) represents a critical authentication bypass where two-factor authentication (2FA) enforcement fails on non-default WordPress login forms. This weakness stems from improper access control (CWE-287) in how the plugin validates authentication requirements. Any WordPress site using Vigilant versions before 2.11.0 is vulnerable if users access login endpoints other than the standard wp-login.php—attackers with valid credentials can completely bypass the second factor, effectively negating the security control that 2FA was designed to provide. Organizations relying on 2FA as a key compensating control against credential compromise face direct exposure to account takeover.

Casky's 283 mapped skills detect this vulnerability pattern by correlating MITRE ATT&CK techniques TA0004 (Privilege Escalation) and TA0006 (Credential Access) with behavioral indicators Claude AI identifies during extended reasoning analysis. Practitioners would observe skill findings flagging authentication enforcement gaps across multiple login entry points, detection of successful logins bypassing secondary authentication checks, and anomalous authentication paths that skip expected 2FA challenges. The platform's skills specifically surface instances where authentication decisions vary by login form endpoint, enabling security teams to identify the conditional nature of this bypass before attackers exploit it operationally.

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Casky Risk Score

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EPSS Probability

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Shodan Exposure

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GreyNoise Signal

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283 Casky skills cover this attack pattern

These skills use Claude AI's reasoning model to surface findings in the same attack categories as CVE-2026-123091.

abusing-dpapi-for-credential-access

red teaming · high

Run

abusing-shadow-credentials-for-privesc

red teaming · high

Run

Access with Stolen Session Cookie

identity access management · low

Run

MITRE ATT&CK Techniques

TA0004 TA0006

Investigate the attack patterns behind CVE-2026-123091

Casky has 283 skills that investigate the attack patterns behind CVE-2026-123091. Run one and get CVSS-scored findings in 3 minutes.

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