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

Quick assessment

Affected
wpmudev WPMU DEV Dashboard
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

wpmudev WPMU DEV Dashboard是wpmudev公司的一款网站管理仪表板插件。 wpmudev WPMU DEV Dashboard 5.0.1及之前版本存在加密问题漏洞，该漏洞源于未经身份验证的wdpsso_step1和wdpsso_step2 AJAX操作中HMAC消息构造不一致且模糊，导致攻击者可通过将domain值移入redirect字段重放有效HMAC，从而绕过身份验证并获取管理员会话。

CVSS 9.8 · Critical EPSS 0.43% · P36

Affected Version Matrix 1

VendorProduct Version RangeStatus
wpmudev WPMU DEV Dashboard ≤ 5.0.1 affected
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I. Basic Information for CVE-2026-76581

Vulnerability Information
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Vulnerability Title
WPMU DEV Dashboard <= 5.0.1 - Authentication Bypass to Administrator via SSO HMAC Canonicalization Confusion
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
密码学签名的验证不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
wpmudev WPMU DEV Dashboard 加密问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
wpmudev WPMU DEV Dashboard是wpmudev公司的一款网站管理仪表板插件。 wpmudev WPMU DEV Dashboard 5.0.1及之前版本存在加密问题漏洞，该漏洞源于未经身份验证的wdpsso_step1和wdpsso_step2 AJAX操作中HMAC消息构造不一致且模糊，导致攻击者可通过将domain值移入redirect字段重放有效HMAC，从而绕过身份验证并获取管理员会话。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
wpmudev WPMU DEV Dashboard 0 ~ 5.0.1 -

II. Public POCs for CVE-2026-76581

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III. Intelligence Information for CVE-2026-76581

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Security Blog Posts for CVE-2026-76581 (1)

Vendor Pages for CVE-2026-76581 (1)

IV. Related Vulnerabilities

Same product: WPMU DEV Dashboard
Same vendor: wpmudev
Same weakness: CWE-347

V. Comments for CVE-2026-76581

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