WordPress 2FA Plugins Fail to Bind Authentication Codes to Accounts

The Two Factor Authentication WordPress plugin before 1.17.0, All-In-One Security (AIOS) WordPress plugin before 5.5.0 do not bind the account whose two-factor code is verified to the account being authenticated, allowing an attacker who knows a victim's password and holds their own two-factor-enabled account to satisfy the victim's second-factor check with their own code and obtain the victim's session.

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

This vulnerability affects the Two Factor Authentication and All-In-One Security (AIOS) WordPress plugins, where the two-factor authentication (2FA) verification process fails to properly bind the verified code to the specific user account being authenticated. An attacker who knows a victim's password and possesses their own 2FA-enabled account can use their own authentication code to satisfy the victim's second-factor requirement, completely bypassing the intended security control. This is a critical authentication bypass that undermines the fundamental purpose of 2FA—even though the victim has enabled multi-factor authentication, the attacker can still gain unauthorized access to their account. The vulnerability affects WordPress site administrators and users relying on these plugins for account security, potentially exposing millions of WordPress installations to account takeover attacks.

Casky's 283 matched security skills leverage Claude AI's extended reasoning to detect the attack patterns behind this vulnerability by analyzing how authentication flows map to MITRE ATT&CK techniques TA0004 (Privilege Escalation) and TA0006 (Credential Access). Practitioners using Casky would observe findings highlighting improper authentication binding during login sequences, detection of 2FA code reuse across different user accounts, and anomalous authentication patterns where a user's 2FA code is validated against a different account's session. The skills would flag the absence of account-specific context validation in the 2FA verification logic, specifically identifying CWE-287 (Improper Authentication) patterns where the verification mechanism doesn't cryptographically link the code to the target account's identity. Security teams would see these detections correlate with suspicious login attempts and session establishment anomalies that indicate potential credential access exploitation.

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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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Composite risk scoring from EPSS, CISA KEV, Shodan, and GreyNoise — 21 security APIs correlated into a single Casky Risk Score. Coming in Casky Pro. Join early access →

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-2026-111739.

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-2026-111739

Casky has 283 skills that investigate the attack patterns behind CVE-2026-111739. Run one and get CVSS-scored findings in 3 minutes.

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