WordPress OTP Plugin Allows Brute-Force Account Takeover

The OTP Login With Phone Number, OTP Verification WordPress plugin before 1.8.71 does not limit the number of OTP verification attempts or invalidate a one-time login code after a wrong guess, and an unauthenticated user can request a login code for any account. Because the code is a short numeric OTP, an attacker can brute-force it and take over any account, including an administrator's.

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 OTP Login With Phone Number, OTP Verification WordPress plugin before version 1.8.71 contains a critical authentication bypass vulnerability that enables unauthenticated attackers to take over any user account, including administrator accounts. The vulnerability stems from three compounding weaknesses: the plugin fails to enforce rate limiting on OTP verification attempts, does not invalidate one-time codes after failed guesses, and allows attackers to request login codes for arbitrary user accounts without authentication. Because the OTP is a short numeric value, attackers can systematically brute-force the code until gaining access. With a CVSS score of 9.1, this vulnerability poses an immediate and severe threat to all WordPress installations using affected versions, potentially exposing sensitive data, enabling malware deployment, and compromising site integrity.

Casky's 283 mapped security skills leverage Claude's extended reasoning to detect the attack patterns underlying CWE-287 (Improper Authentication) and the associated MITRE ATT&CK techniques—TA0004 (Privilege Escalation) and TA0006 (Credential Access). Practitioners using Casky would identify multiple red flags: excessive failed OTP submission requests from single IP addresses, successful logins following patterns of repeated verification attempts, and account access preceded by suspicious login code requests for administrative accounts. The platform's skills would correlate these indicators with known brute-force attack signatures, authentication anomalies, and privilege escalation post-exploitation behaviors, enabling defenders to detect both active exploitation attempts and retrospective evidence of compromise in their WordPress 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-2026-15210.

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-2026-15210

Casky has 283 skills that investigate the attack patterns behind CVE-2026-15210. Run one and get CVSS-scored findings in 3 minutes.

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