WP 2FA Plugin Fails to Invalidate Used One-Time Passcodes

The WP 2FA WordPress plugin before 4.1.0 does not invalidate a time-based one-time passcode once it has been used, allowing an attacker who knows an account's password and has observed a valid code within its validity window to replay it and bypass two-factor authentication, including on administrator accounts.

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 WP 2FA WordPress plugin before version 4.1.0 contains a critical authentication bypass vulnerability where time-based one-time passcodes (TOTP) are never invalidated after successful use. This means an attacker who obtains a valid code—either through password compromise, phishing, or observation—can replay that same code multiple times within its validity window to gain unauthorized access. For WordPress administrators managing sensitive content, user data, and site configurations, this vulnerability is particularly dangerous because it effectively reduces two-factor authentication to single-factor protection. Organizations relying on this plugin for securing WordPress environments face elevated risk of account takeover, especially for high-privilege administrative accounts that control site-wide settings and access.

Casky's 283 mapped security skills use Claude's extended reasoning to identify the attack patterns underlying this vulnerability across MITRE ATT&CK's credential access (TA0004) and privilege escalation (TA0006) techniques. Practitioners will see detection findings that highlight suspicious authentication patterns: repeated authentication attempts using identical TOTP codes within short timeframes, successful logins following failed password attempts (indicating compromise followed by code reuse), and anomalous access to administrator functions from unfamiliar locations or IP addresses. The skills correlate these signals with known replay attack indicators, flagging when the same one-time code appears in authentication logs multiple times, which should never occur in properly functioning TOTP systems. This multi-technique analysis helps security teams distinguish legitimate authentication from sophisticated account takeover attempts targeting their WordPress infrastructure.

Live Threat IntelligenceComing soon

Casky Risk Score

—

EPSS Probability

—

Shodan Exposure

—

GreyNoise Signal

—

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-2026-103514.

abusing-dpapi-for-credential-access

red teaming · high

Run

abusing-shadow-credentials-for-privesc

red teaming · high

Run

Access with Stolen Session Cookie

cryptography · low

Run

MITRE ATT&CK Techniques

TA0004 TA0006

Investigate the attack patterns behind CVE-2026-103514

Casky has 283 skills that investigate the attack patterns behind CVE-2026-103514. Run one and get CVSS-scored findings in 3 minutes.

Run the skill that detects this →

X Instagram LinkedIn