# CVE-2026-9858: Missing authorization in Partial Shipment for WooCommerce

> Authenticated subscribers can read and modify arbitrary order shipment details due to missing authorization checks in AJAX handlers.

- **Severity:** Medium 4.3 (`CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/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:** 19 Sep 2026
- **Updated:** 20 Sep 2026
- **Also known as:** GHSA-57j3-8vm6-c5m2

## What is CVE-2026-9858?

CVE-2026-9858 is a medium-severity missing authorization vulnerability in wpexpertshub Partial Shipment for WooCommerce, published on 19 Sep 2026. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

The Partial Shipment for Woocommerce plugin for WordPress is vulnerable to Missing Authorization in versions up to, and including, 3.4 via the wxp_order_shipment, wxp_order_item_shipment, and wxp_order_set_shipped AJAX actions. This is due to the AJAX handlers in woocommerce-partial-shipment.php (registered at lines 60–62 and implemented at lines 228, 263, and 291) lacking both capability checks and nonce verification, and not validating the calling user's ownership of the supplied order_id. This makes it possible for authenticated attackers, with Subscriber-level access and above, to read arbitrary order item details (names, quantities, shipped counts) belonging to any customer and to modify the shipment status / shipped quantities of any order, which can also trigger order status transitions via the wxp_order_status action.

Weakness: CWE-862 (Missing Authorization)

## Which versions are affected by CVE-2026-9858?


## How do I fix CVE-2026-9858?

No fix has been published for CVE-2026-9858 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-9858 being exploited?

There is no known exploitation of CVE-2026-9858 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-9858 and fix it if it is affected.

What it is: CVE-2026-9858 is a medium-severity missing authorization vulnerability in wpexpertshub Partial Shipment for WooCommerce, published on 19 Sep 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-2026-9858 in the wild and no public exploit code.

Affected product: wpexpertshub Partial Shipment 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-2026-9858/ (Markdown: https://insights.sbomify.com/CVE-2026-9858/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-9858
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-9858
- OSV: https://osv.dev/vulnerability/CVE-2026-9858

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-9858/
Summaries are generated and may contain mistakes; the official description above is the record.