# CVE-2026-3688: Privilege escalation in WCFM Membership – WooCommerce Memberships for Multivendor Marketplace

> Authenticated vendors can escalate privileges by modifying other users' roles via an insecure direct object reference in the WCFM Membership plugin.

- **Severity:** High 8.1 (`CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 8 Jul 2026
- **Updated:** 8 Jul 2026
- **Also known as:** GHSA-2jfc-5xjv-8mv7

## What is CVE-2026-3688?

CVE-2026-3688 is a high-severity vulnerability in wclovers WCFM Membership – WooCommerce Memberships for Multivendor Marketplace, published on 8 Jul 2026. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

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.

Weakness: CWE-639 (Authorization Bypass Through User-Controlled Key)

## Which versions are affected by CVE-2026-3688?


## How do I fix CVE-2026-3688?

No fix has been published for CVE-2026-3688 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-3688 being exploited?

There is no known exploitation of CVE-2026-3688 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-3688 and fix it if it is affected.

What it is: CVE-2026-3688 is a high-severity vulnerability in wclovers WCFM Membership – WooCommerce Memberships for Multivendor Marketplace, published on 8 Jul 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-3688 in the wild and no public exploit code.

Affected product: wclovers WCFM Membership – WooCommerce Memberships for Multivendor Marketplace. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-3688/ (Markdown: https://insights.sbomify.com/CVE-2026-3688/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-3688
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-3688
- OSV: https://osv.dev/vulnerability/CVE-2026-3688

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From sbomify Insights: https://insights.sbomify.com/CVE-2026-3688/
Summaries are generated and may contain mistakes; the official description above is the record.