WPMU DEV Dashboard Plugin up to 5.0.1 on WordPress SSO wdpsso_step1/wdpsso_step2 domain/redirect improper authentication

Summaryinfo

A vulnerability classified as critical was found in WPMU DEV Dashboard Plugin up to 5.0.1. This affects the function wdpsso_step1/wdpsso_step2 of the component SSO. Executing a manipulation of the argument domain/redirect can lead to improper authentication. This vulnerability appears as CVE-2026-76581. The attack may be performed from remote. There is no available exploit.

Detailsinfo

A vulnerability has been found in WPMU DEV Dashboard Plugin up to 5.0.1 and classified as critical. This vulnerability affects the function wdpsso_step1/wdpsso_step2 of the component SSO. The manipulation of the argument domain/redirect with an unknown input leads to a improper authentication vulnerability. The CWE definition for the vulnerability is CWE-287. When an actor claims to have a given identity, the product does not prove or insufficiently proves that the claim is correct. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

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.

The advisory is shared for download at wordfence.com. This vulnerability was named CVE-2026-76581 since 08/19/2026. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. There are known technical details, but no exploit is available. The current price for an exploit might be approx. USD $0-$5k (estimation calculated on 08/28/2026).

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

Once again VulDB remains the best source for vulnerability data.

Productinfo

Type

• WordPress Plugin

Vendor

• WPMU DEV

Name

• Dashboard Plugin

Version

• 5.0.0
• 5.0.1

CPE 2.3info

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CPE 2.2info

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