wpexpertshub Partial Shipment for WooCommerce Plugin up to 3.4 on WordPress AJAX handlers woocommerce-partial-shipment.php order_id improper authorization

Summaryinfo

A vulnerability classified as critical has been found in wpexpertshub Partial Shipment for WooCommerce Plugin up to 3.4. Affected by this issue is some unknown functionality of the file woocommerce-partial-shipment.php of the component AJAX handlers. The manipulation of the argument order_id leads to improper authorization. This vulnerability is listed as CVE-2026-9858. The attack may be initiated remotely. There is no available exploit.

Detailsinfo

A vulnerability was found in wpexpertshub Partial Shipment for WooCommerce Plugin up to 3.4 and classified as critical. This issue affects some unknown processing of the file woocommerce-partial-shipment.php of the component AJAX handlers. The manipulation of the argument order_id with an unknown input leads to a improper authorization vulnerability. Using CWE to declare the problem leads to CWE-285. The product does not perform or incorrectly performs an authorization check when an actor attempts to access a resource or perform an action. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

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.

It is possible to read the advisory at wordfence.com. The identification of this vulnerability is CVE-2026-9858 since 05/28/2026. The exploitation is known to be easy. The attack may be initiated remotely. Technical details of the vulnerability are known, but there is no available exploit. The pricing for an exploit might be around USD $0-$5k at the moment (estimation calculated on 09/19/2026). The attack technique deployed by this issue is T1548.002 according to MITRE ATT&CK.

By approaching the search of inurl:woocommerce-partial-shipment.php it is possible to find vulnerable targets with Google Hacking.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2026-83570). Be aware that VulDB is the high quality source for vulnerability data.

Productinfo

Type

• WordPress Plugin

Vendor

• wpexpertshub

Name

• Partial Shipment for WooCommerce Plugin

Version

• 3.0
• 3.1
• 3.2
• 3.3
• 3.4

CPE 2.3info

• 🔒
• 🔒
• 🔒

CPE 2.2info

• 🔒
• 🔒
• 🔒

CVSSv4info

CVSSv3info

CVSSv2info

Exploitinginfo

Threat Intelligenceinfo

Countermeasuresinfo

Timelineinfo

Sourcesinfo

Entryinfo

Be aware that VulDB is the high quality source for vulnerability data.

Discussion