WordPress WPMU DEV Dashboard plugin <= 5.0.1 - Authentication Bypass to Administrator via SSO HMAC Canonicalization Confusion vulnerability

Authentication Bypass to Administrator via SSO HMAC Canonicalization Confusion vulnerability discovered by WordFence in WordPress Plugin WPMU DEV Dashboard versions = 5.0.1...

CVE-2026-76581 WPMU DEV Dashboard <= 5.0.1 - Authentication Bypass to Administrator via SSO HMAC Canonicalization Confusion

The WPMU DEV Dashboard plugin for WordPress is vulnerable to Authentication Bypass in all versions up to, and including, 5.0.1. This is due to inconsistent and ambiguous HMAC message construction between the unauthenticated wdpssostep1 and wdpssostep2 AJAX actions, where step 1 signs and disclose...

PT-2026-82837

Name of the Vulnerable Software and Affected Versions WPMU DEV Dashboard versions prior to 5.0.2 Description An authentication bypass exists in the Hub Single Sign-On SSO flow, potentially affecting an estimated 350,000 WordPress sites. The issue stems from HMAC canonicalization confusion—a...