EUVD-2026-67464
GHSA-2cxw-5886-mfv5
Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Unauthenticated network-reachable AJAX replay (PR:N/UI:N/AC:L) yielding a full administrator session gives C:H/I:H/A:H; the Hub SSO config precondition is a deployment scope factor not captured by 3.1 base metrics.
Primary rating from Vendor (Wordfence).
CVSS VectorVendor: Wordfence
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Lifecycle Timeline
2DescriptionCVE.org
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.
Articles & Coverage 2
AnalysisAI
Authentication bypass in the WPMU DEV Dashboard WordPress plugin (all versions through 5.0.1) lets an unauthenticated attacker forge a valid administrator session by abusing an HMAC signature-verification flaw in the Hub SSO login flow. Because the signing routine in the unauthenticated wdpsso_step1 action covers a different, unseparated field concatenation than the verifier in wdpsso_step2, an attacker can obtain a legitimately signed token and replay it with fields rearranged to authenticate as admin. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires the target WordPress site to be connected to WPMU DEV with the Hub SSO feature enabled and the SSO mapping pointed at an administrator account - this is the exact precondition stated in the description and is the primary factor limiting exploitation. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 vector (AV:N/AC:L/PR:N/UI:N, C:H/I:H/A:H, 9.8 Critical) indicates remote, unauthenticated, low-complexity exploitation with full compromise - consistent with an authentication bypass that yields an administrator session. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | No vendor-released patch version is identified in the provided data; the description states all versions through 5.0.1 are vulnerable, which implies a fixed release above 5.0.1 but this could not be independently confirmed, so upgrade to the latest available WPMU DEV Dashboard release and monitor https://wpmudev.com/project/wpmu-dev-dashboard/ and the Wordfence advisory for the exact patched version. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: Audit all WordPress installations for WPMU DEV Dashboard plugin versions through 5.0.1 and immediately disable affected instances or implement network-level access restrictions via WAF/IP whitelisting for administrative functions. …
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External POC / Exploit Code
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