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CVE-2026-15981— SAML Single Sign On <= 5.4.4 - Unauthenticated Authentication Bypass via SAMLResponse Parameter

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.

miniorange SAML Single Sign On – SSO Login是miniorange公司的一个单点登录插件。 miniorange SAML Single Sign On – SSO Login 5.4.4及之前版本存在授权问题漏洞，该漏洞源于mo_saml_validate_signature()函数对PHP的openssl_verify()返回的原始三态整数执行了宽松的布尔检查，导致错误返回值-1被评估为真值，从而被视为成功的签名验证，使得未经身份验证的攻击者能够以任何现有Wor

CVSS 9.8 · Critical EPSS 0.55% · P43

Possible ATT&CK Techniques 1 AI

T1078 · Valid Accounts

Affected Version Matrix 1

VendorProduct Version RangeStatus
cyberlord92 SAML Single Sign On – SSO Login ≤ 5.4.4 affected
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I. Basic Information for CVE-2026-15981

Vulnerability Information
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Vulnerability Title
SAML Single Sign On <= 5.4.4 - Unauthenticated Authentication Bypass via SAMLResponse Parameter
Source: CVE Program / CVE List V5
Vulnerability Description
The SAML Single Sign On – SSO Login plugin for WordPress is vulnerable to Authentication Bypass in all versions up to, and including, 5.4.4. This is due to the mo_saml_validate_signature() function performing a loose boolean check on the raw tri-state integer returned by PHP's openssl_verify(), causing an error return value of -1 to be evaluated as truthy and therefore treated as a successful signature verification. This makes it possible for unauthenticated attackers to log in as any existing WordPress user, including administrators, by submitting a crafted SAMLResponse containing an attacker-controlled NameID and a deliberately malformed signature value that triggers an OpenSSL processing error — bypassing verification entirely and resulting in wp_set_auth_cookie() being called for the targeted account.
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
认证机制不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
miniorange SAML Single Sign On – SSO Login 授权问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
miniorange SAML Single Sign On – SSO Login是miniorange公司的一个单点登录插件。 miniorange SAML Single Sign On – SSO Login 5.4.4及之前版本存在授权问题漏洞，该漏洞源于mo_saml_validate_signature()函数对PHP的openssl_verify()返回的原始三态整数执行了宽松的布尔检查，导致错误返回值-1被评估为真值，从而被视为成功的签名验证，使得未经身份验证的攻击者能够以任何现有Wor
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
cyberlord92 SAML Single Sign On – SSO Login 0 ~ 5.4.4 -

II. Public POCs for CVE-2026-15981

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III. Intelligence Information for CVE-2026-15981

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Patches & Fixes for CVE-2026-15981 (2)

Vendor Advisories for CVE-2026-15981 (1)

IV. Related Vulnerabilities

Same product: SAML Single Sign On – SSO Login
Same vendor: cyberlord92
Same weakness: CWE-287

V. Comments for CVE-2026-15981

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