WordPress WooCommerce Memberships Plugin Authorization Bypass

The WCFM Membership – WooCommerce Memberships for Multivendor Marketplace plugin for WordPress is vulnerable to Insecure Direct Object Reference in all versions up to, and including, 2.11.10. This is due to the 'wcfmvm_membership_change' AJAX action not validating user permission to modify other users. This makes it possible for authenticated attackers, with vendor level access and above, to change any user's role to 'wcfm_vendor' by changing their membership plan.

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 WCFM Membership plugin for WordPress contains an Insecure Direct Object Reference (IDOR) vulnerability in its AJAX membership change functionality. Attackers with vendor-level access can bypass authorization checks to arbitrarily escalate any user's role to 'wcfm_vendor,' effectively granting them marketplace selling privileges. This affects all versions up to 2.11.10 and impacts WordPress multivendor marketplaces that rely on role-based access control. The vulnerability is particularly dangerous because it enables privilege escalation without admin intervention, allowing threat actors to create unauthorized vendor accounts or compromise existing user accounts.

Casky's 283 mapped skills leverage Claude AI with extended reasoning to detect the attack patterns underlying this CVE across MITRE ATT&CK techniques TA0004 (Privilege Escalation) and TA0006 (Credential Access). Practitioners using Casky would identify suspicious patterns including: direct object references in AJAX handlers without capability checks, unvalidated user ID parameters in membership modification requests, and unauthorized role assignment operations. The platform's skill set would flag insecure direct object reference exploitation attempts, detect lateral movement indicators where vendor accounts access resources beyond their scope, and highlight authentication bypass signatures. Practitioners would see actionable findings showing which AJAX actions lack proper authorization validation, enabling them to prioritize patching and implement additional access control layers before exploitation occurs.

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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-2026-3688.

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-2026-3688

Casky has 283 skills that investigate the attack patterns behind CVE-2026-3688. Run one and get CVSS-scored findings in 3 minutes.

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