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CVE-2026-76581

CRITICAL 9.8 CVSS 3.1
Published
August 28, 2026
Last modified
August 28, 2026
NVD status
Deferred
Reported by
security@wordfence.com
Weakness
CWE-347
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Description

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.

Affected products and versions

  • wpmudev WPMU DEV Dashboard — Up to and including 5.0.1

References

  • wpmudev.com https://wpmudev.com/project/wpmu-dev-dashboard/
  • www.wordfence.com https://www.wordfence.com/threat-intel/vulnerabilities/id/3d4321c8-15a4-46f5-9b0e-2098a7fcfb5b?source=cve
  • nvd.nist.gov Official NVD record