Klubraum Membership Request Plugin up to 1.1.0 on WordPress kr_mr_store_settings improper authorization

Summaryinfo

A vulnerability was found in Klubraum Membership Request Plugin up to 1.1.0. It has been declared as critical. The impacted element is the function kr_mr_store_settings. The manipulation results in improper authorization. This vulnerability was named CVE-2026-4604. The attack may be performed from remote. There is no available exploit.

Detailsinfo

A vulnerability classified as critical has been found in Klubraum Membership Request Plugin up to 1.1.0. Affected is the function kr_mr_store_settings. The manipulation 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 Klubraum Membership Request plugin for WordPress is vulnerable to unauthorized modification of data due to a missing capability check on the `kr_mr_store_settings()` function in all versions up to, and including, 1.1.0. This makes it possible for unauthenticated attackers to update the plugin's settings, including the Klubraum API token and introduction text, effectively hijacking the plugin's integration with the Klubraum service.

The advisory is available at wordfence.com. This vulnerability is traded as CVE-2026-4604 since 03/22/2026. 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 07/29/2026). 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

Vendor

• Klubraum

Name

• Membership Request Plugin

Version

• 1.0
• 1.1.0

CPE 2.3info

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CPE 2.2info

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Entryinfo

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

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