Shipo Plugin up to 1.8.0 on WordPress REST API authenticate_rest_user LOGGED_IN_COOKIE improper authorization

Summaryinfo

A vulnerability described as critical has been identified in Shipo Plugin up to 1.8.0. Impacted is the function authenticate_rest_user of the component REST API. The manipulation of the argument LOGGED_IN_COOKIE results in improper authorization. This vulnerability is reported as CVE-2026-19907. The attack can be launched remotely. No exploit exists.

Detailsinfo

A vulnerability was found in Shipo Plugin up to 1.8.0. It has been classified as critical. Affected is the function authenticate_rest_user of the component REST API. The manipulation of the argument LOGGED_IN_COOKIE with an unknown input leads to a improper authorization vulnerability. CWE is classifying the issue as 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. This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes:

The Shipo plugin for WordPress is vulnerable to Authentication Bypass in versions 1.6 through 1.8.0. This is due to the `authenticate_rest_user()` function parsing the `LOGGED_IN_COOKIE` value and authenticating the named user without verifying the cookie's cryptographic signature. The function's intended `/wp-json/shipo/` route restriction can also be bypassed by placing that substring in the query string of an unrelated REST endpoint. This makes it possible for unauthenticated attackers who know an existing username to impersonate that user, including an administrator, and perform authorized actions through the REST API, including creating another administrator account.

The advisory is available at wordfence.com. This vulnerability is traded as CVE-2026-19907 since 08/14/2026. The exploitability is told to be easy. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. Technical details are known, but there is no available exploit. The structure of the vulnerability defines a possible price range of USD $0-$5k at the moment (estimation calculated on 11/14/2026). This vulnerability is assigned to T1548.002 by the MITRE ATT&CK project.

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

If you want to get best quality of vulnerability data, you may have to visit VulDB.

Productinfo

Type

• WordPress Plugin

Name

• Shipo Plugin

Version

• 1.0
• 1.1
• 1.2
• 1.3
• 1.4
• 1.5
• 1.6
• 1.7
• 1.8.0

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CPE 2.2info

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If you want to get best quality of vulnerability data, you may have to visit VulDB.

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