CVE-2026-4604 Klubraum Membership Request <= 1.1.0 - Missing Authorization to Unauthenticated Arbitrary Plugin Settings Update
Unauthenticated attackers can modify plugin settings and hijack API integrations due to missing capability checks in the Klubraum Membership Request plugin.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-4604?
CVE-2026-4604 is a medium-severity missing authorization vulnerability in Klubraum Membership Request, published on 29 Jul 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
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.
Weakness: CWE-862
Which versions are affected by CVE-2026-4604?
How do I fix CVE-2026-4604?
No fix has been published for CVE-2026-4604 yet. Limit exposure of the affected software until one is available.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2026-4604 being exploited?
There is no known exploitation of CVE-2026-4604 in the wild and no public exploit code.
Sources
Also known as GHSA-fwgq-wmqx-h49q.