WordPress 2FA Bypass via Unenforced REST Endpoints

The Really Simple Security WordPress plugin before 9.5.10.1 does not enforce the second-factor challenge in two of its two-factor authentication REST endpoints, allowing an attacker who knows a user's password to obtain a WordPress authentication session for that user without completing the email OTP challenge.

Casky was already ahead

This CVE exploits attack patterns that Casky's 261matched 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 Really Simple Security WordPress plugin before version 9.5.10.1 contains a critical authentication bypass vulnerability where two REST API endpoints fail to enforce second-factor authentication challenges. This means attackers who obtain a user's password—through credential stuffing, phishing, or data breaches—can bypass the plugin's two-factor authentication entirely by directly calling these unprotected endpoints to establish a valid WordPress session. The vulnerability affects any WordPress installation using this popular security plugin, potentially compromising sites that believed their additional authentication layer was protecting accounts. The severity is amplified by the fact that 2FA bypass attacks are among the most damaging, as they undermine the entire premise of defense-in-depth security architecture.

Casky's 261 matching skills detect the attack patterns underlying this vulnerability by mapping to MITRE ATT&CK's TA0004 (Privilege Escalation) and TA0006 (Credential Access) techniques. Practitioners using Casky would identify suspicious REST API calls to the vulnerable endpoints without corresponding second-factor completion logs, detect successful session creation events that lack OTP verification in authentication audit trails, and spot anomalous login patterns where users authenticate from unexpected locations without completing the 2FA challenge. Claude's extended reasoning capabilities help correlate seemingly normal API traffic with the absence of expected security control validation steps, surfacing the gap between the authentication mechanism's intended design and its actual enforcement. Security teams would see findings highlighting REST endpoint access logs showing successful authentication bypasses, allowing them to hunt for exploitation attempts and immediately patch affected plugin versions.

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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 →

261 Casky skills cover this attack pattern

These skills use Claude AI's reasoning model to surface findings in the same attack categories as CVE-2026-8293.

analyzing-cloud-storage-access-patterns

cloud security · low

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analyzing-kubernetes-audit-logs

container security · low

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analyzing-malicious-url-with-urlscan

phishing defense · medium

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MITRE ATT&CK Techniques

TA0004 TA0006

Investigate the attack patterns behind CVE-2026-8293

Casky has 261 skills that investigate the attack patterns behind CVE-2026-8293. Run one and get CVSS-scored findings in 3 minutes.

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