Klubraum Membership Request <= 1.1.0 - Missing Authorization to Unauthenticated Arbitrary Plugin Settings Update
Strategic Overview
- Status
- Patched in 1.1.1
- Affected Plugin
- Klubraum Membership Request
- Affected Version
<= 1.1.0- CVSS
- 5.3Medium
- Weakness type
- CWE-862 · Missing Authorization
- CVE
CVE-2026-4604
At a glance
CVE-2026-4604 is a medium-severity Missing Authorization vulnerability in the Klubraum Membership Request WordPress plugin, affecting versions <= 1.1.0. It carries a CVSS score of 5.3 (reachable over the network; low attack complexity). Exploitation requires no authentication. The issue is fixed in version 1.1.1; sites on affected versions should update now. Disclosed July 2026, reported by Md. Moniruzzaman Prodhan (NomanProdhan).
Vulnerability Overview
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.
Technical Analysis
The vector marks this flaw as remotely reachable over the network, with low attack complexity — no special timing or configuration is needed, and no privileges on the target site, and no interaction from a victim user.
CWE-862: Missing Authorization
Klubraum Membership Request <= 1.1.0 carries this weakness at kr_mr_store_settings(), and reaching it takes no account at all. A missing authorization check means a function is reachable by anyone who can reach the endpoint, because the code never asks whether the caller is allowed to perform the action.
Any user who can reach the endpoint gets to run an action reserved for higher-privileged roles, from reading protected data to changing settings or content. For Klubraum Membership Request the fix is 1.1.1: builds <= 1.1.0 are affected, anything from 1.1.1 onward is not.
Remediation
Update to version 1.1.1, or a newer patched version
How does WordSec protect against this?
This one needs no account at all, which puts it outside what login hardening can reach; WordSec's login security narrows the account-level paths around it, and the firewall is what inspects the request itself. None of that substitutes for the fix: Klubraum Membership Request 1.1.1 closes this, and updating the plugin is the step that ends it.
- Login Security
- Alerts
External References
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