# CVE-2026-12126: WCFM Marketplace <= 3.7.3 - Authenticated (Vendor+) Stored Cross-Site Scripting via Attachment 'post_title'

> Authenticated vendors can inject arbitrary scripts via attachment titles, leading to code execution or account takeover when privileged users view the media dashboard.

- **Severity:** Medium 6.4 (`CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N`)
- **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:** 11 Jul 2026
- **Updated:** 13 Jul 2026
- **Also known as:** GHSA-392f-h24w-84fc

## What is CVE-2026-12126?

CVE-2026-12126 is a medium-severity cross-site scripting vulnerability in wclovers WCFM Marketplace – Multivendor Marketplace for WooCommerce, published on 11 Jul 2026. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

The WCFM Marketplace – Multivendor Marketplace for WooCommerce plugin for WordPress is vulnerable to Stored Cross-Site Scripting via Attachment 'post_title' in all versions up to, and including, 3.7.3 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with Vendor-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. An attacker can plant the payload by uploading a media attachment with a crafted title via the WordPress REST API (/wp-json/wp/v2/media), without ever invoking the AJAX endpoint themselves, as the unescaped title is later emitted inside DataTables JSON and inserted as innerHTML upon any privileged user loading the media dashboard.

Weakness: CWE-79 (Improper Neutralization of Input During Web Page Generation)

## Which versions are affected by CVE-2026-12126?


## How do I fix CVE-2026-12126?

No fix has been published for CVE-2026-12126 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-12126 being exploited?

There is no known exploitation of CVE-2026-12126 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-12126 and fix it if it is affected.

What it is: CVE-2026-12126 is a medium-severity cross-site scripting vulnerability in wclovers WCFM Marketplace – Multivendor Marketplace for WooCommerce, published on 11 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-2026-12126 in the wild and no public exploit code.

Affected product: wclovers WCFM Marketplace – Multivendor Marketplace for WooCommerce. 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-2026-12126/ (Markdown: https://insights.sbomify.com/CVE-2026-12126/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-12126
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-12126
- OSV: https://osv.dev/vulnerability/CVE-2026-12126

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From sbomify Insights: https://insights.sbomify.com/CVE-2026-12126/
Summaries are generated and may contain mistakes; the official description above is the record.