UsersWP Plugin Bypasses Two-Factor Authentication Validation

The UsersWP WordPress plugin before 1.2.67 does not validate the selected authentication provider in its two-factor login handler, allowing an attacker who already knows a user's credentials to bypass the second authentication 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

CVE-2026-13690 affects the UsersWP WordPress plugin before version 1.2.67, exposing a critical authentication weakness where the two-factor login handler fails to properly validate the selected authentication provider. An attacker with valid user credentials can exploit this validation gap to bypass the second authentication factor entirely, gaining unauthorized access to user accounts. This vulnerability is particularly dangerous because it undermines defense-in-depth strategies—organizations deploying two-factor authentication as a core security control discover it provides no protection against this specific attack vector. WordPress site administrators using UsersWP, especially those managing sites with sensitive content or privileged user accounts, face direct risk of account compromise.

Casky.ai's 283 matching skills detect the attack patterns mapped to MITRE ATT&CK techniques TA0004 (Privilege Escalation) and TA0006 (Credential Access) by analyzing authentication flow anomalies and provider validation failures. Practitioners using Casky would identify findings showing: (1) missing or insufficient validation checks in the two-factor authentication provider selection logic, revealing CWE-287 (Improper Authentication) patterns; (2) suspicious authentication sequences where users bypass the second factor without proper provider verification; and (3) lateral movement attempts following successful credential reuse. Claude's extended reasoning capability correlates these indicators across multiple security skills, enabling practitioners to distinguish between legitimate authentication errors and targeted bypass attempts, then map remediation priorities to specific vulnerable code paths before exploitation occurs in their environments.

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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-2026-13690.

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-2026-13690

Casky has 283 skills that investigate the attack patterns behind CVE-2026-13690. Run one and get CVSS-scored findings in 3 minutes.

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