WCFM - WooCommerce Multivendor Membership <= 2.11.10 - Insecure Direct Object Reference to Limited Privilege Escalation via User Role Overwrite
Strategic Overview
- Status
- Patched in 2.11.11
- Affected Version
<= 2.11.10- CVSS
- 8.1High
- Weakness type
- CWE-639 · Authorization Bypass Through User-Controlled Key
- CVE
CVE-2026-3688
At a glance
CVE-2026-3688 is a high-severity Authorization Bypass Through User-Controlled Key vulnerability in the WCFM Membership WordPress plugin, affecting versions <= 2.11.10. It carries a CVSS score of 8.1 (reachable over the network; low attack complexity; high integrity, availability impact). The issue is fixed in version 2.11.11; sites on affected versions should update now. Disclosed July 2026, reported by Osvaldo Noe Gonzalez Del Rio (Os).
Vulnerability Overview
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.
Technical Analysis
The vector marks this flaw as remotely reachable over the network, with low attack complexity — no special timing or configuration is needed, and no interaction from a victim user. A successful exploit has high impact on integrity, availability.
CWE-639: Authorization Bypass Through User-Controlled Key
WCFM Membership <= 2.11.10 carries this weakness at wcfmvm_membership_change, and reaching it takes a caller who can reach the endpoint. Authorization bypass through a user-controlled key, often called insecure direct object reference, means the application looks up a record by an identifier from the request without checking that the caller owns it.
Changing a number in the request is enough to read or modify other users' records, which on commerce and membership sites means customer data. For WCFM Membership the fix is 2.11.11: builds <= 2.11.10 are affected, anything from 2.11.11 onward is not.
Remediation
Update to version 2.11.11, or a newer patched version
How does WordSec protect against this?
Because it turns on account access, WordSec's login security is the relevant layer: role-based two-factor, captcha and brute-force limits raise the cost of getting the account this needs. None of that substitutes for the fix: WCFM Membership 2.11.11 closes this, and updating the plugin is the step that ends it.
- Login Security
- Alerts
External References
Related records
Same weakness class
Other vulnerabilities in WCFM Membership – WooCommerce Memberships for Multivendor Marketplace
- 9.8CVE-2022-4939: WCFM Membership <= 2.10.0 Privilege Escalation
CVE-2022-4939 - 7.3CVE-2022-4940: WCFM Membership <= 2.10.0 Missing Authorization
CVE-2022-4940 - 6.3CVE-2022-4941: WCFM Membership <= 2.9.10 Cross-Site Request Forgery
CVE-2022-4941 - 5.3CVE-2026-42753: WCFM Membership Missing Authorization
CVE-2026-42753
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