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CVE-2026-76581: WPMU DEV Dashboard

Severity

9.8 (CRITICAL)

Vendor

WPMUDEV

Affected versions

0 through 5.0.1

Fixed version

unknown

Patch status

Unpatched

Published

2026-08-28T08:16:41.463

Modified

2026-08-28T20:19:54.767

Why it matters

This matters because the affected product may be exposed on public websites. A vulnerable plugin can create a direct path to site compromise, malicious code deployment, or data theft.

Recommended admin actions

• Prioritize validation immediately due to critical CVSS severity.
• Check whether the affected WordPress plugin is installed.
• Update, disable, or remove the affected component if present.
• Treat internet-facing systems as higher priority.

Technical summary

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 `wdpsso_step1` and `wdpsso_step2` AJAX actions, where step 1 signs and discloses an unseparated concatenation of the token, state, redirect, and domain values, while step 2 verifies an unseparated concatenation that omits the domain field. This makes it possible for unauthenticated attackers, on sites connected to WPMU DEV with Hub SSO enabled and mapped to an administrator, to obtain a valid HMAC from step 1 and replay it to step 2 by moving the domain value into the redirect field, resulting in an authenticated administrator session.

View the official NVD record for CVE-2026-76581

AI-enriched (MEDIUM confidence). Validate against the vendor advisory before taking production action.