What’s Vulnerable › Vulnerabilities

CVE-2026-4604: Klubraum Membership Request <= 1.1.0 - Missing Authorization to Unauthenticated Arbitrary Plugin Settings Update

• Severity: medium (CVSS 5.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-07-29 · updated 2026-07-30
• Weakness: CWE-862

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.

Affected products

• Klubraum Membership Request: through 1.1.0

References

• https://plugins.trac.wordpress.org/browser/klubraum-membership-request/tags/1.1.0/admin/class-klubraum-membership-request-widget-admin.php#L151
• https://plugins.trac.wordpress.org/browser/klubraum-membership-request/tags/1.1.0/admin/class-klubraum-membership-request-widget-admin.php#L152
• https://plugins.trac.wordpress.org/browser/klubraum-membership-request/trunk/admin/class-klubraum-membership-request-widget-admin.php#L152
• https://plugins.trac.wordpress.org/changeset?sfp_email=&sfph_mail=&reponame=&new=3491619%40klubraum-membership-request%2Ftrunk%2Fadmin%2Fclass-klubraum-membership-request-widget-admin.php&old=2512635%40klubraum-membership-request%2Ftrunk%2Fadmin%2Fclass-klubraum-membership-request-widget-admin.php
• https://www.wordfence.com/threat-intel/vulnerabilities/id/09e158d2-f9a6-41a6-a91f-1763a1a44b04?source=cve

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