CVE-2026-75807— SAML Single Sign On <= 5.4.6 - Unauthenticated Authentication Bypass via X.509 Certificate Poisoning
Quick assessment
Affected
cyberlord92 SAML Single Sign On – SSO Login
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.
WordPress 的 SAML 单点登录（SSO）插件在 5.4.6 及更早版本中存在身份验证绕过漏洞。该漏洞的成因在于， ACS 处理程序在强制执行签名验证结果之前，将从传入的 SAMLResponse 中提取的 X.509 证书持久化存储到 选项中，因为当指纹不匹配时， 仅返回 false 而未停止执行流程。这使得未认证的攻击者可以用攻击者控制的值覆盖插件中存储的 IdP 签名证书，随后即可伪造任意 WordPress 账户（包括管理员账户）的 SAML 断言，从而获取完全受权的会话。注意：利用该漏洞需要管理
Possible ATT&CK Techniques 1 AI
T1556 · Modify Authentication ProcessAffected Version Matrix 1
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| cyberlord92 | SAML Single Sign On – SSO Login | ≤ 5.4.6 |
affected |
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I. Basic Information for CVE-2026-75807
Vulnerability Information
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Vulnerability Title
SAML Single Sign On <= 5.4.6 - Unauthenticated Authentication Bypass via X.509 Certificate Poisoning
Source: CVE Program / CVE List V5
Vulnerability Description
The SAML Single Sign On – SSO Login plugin for WordPress is vulnerable to Authentication Bypass in versions up to, and including, 5.4.6. This is due to the mo_saml_login_validate() ACS handler persisting the X.509 certificate extracted from an incoming SAMLResponse into the mo_saml_required_certificate option before the signature-validation verdict is enforced, because mo_saml_find_certificate() returns false on a fingerprint mismatch rather than halting execution. This makes it possible for unauthenticated attackers to overwrite the plugin's stored IdP signing certificate with an attacker-controlled value, and subsequently forge SAML assertions for any WordPress account — including administrators — to obtain a fully privileged session. Note: The exploit requires the administrator to perform a repair after receiving the test_config_error_wpsamlerr004 error message during the test configuration.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
认证机制不恰当
Source: CVE Program / CVE List V5
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| cyberlord92 | SAML Single Sign On – SSO Login | 0 ~ 5.4.6 | - |
|
II. Public POCs for CVE-2026-75807
| # | POC Description | Source Link | Shenlong Link |
|---|
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Vendor Pages for CVE-2026-75807 (2)
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