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CVE-2026-15013— SAML Single Sign On <= 5.4.3 - Unauthenticated Authentication Bypass via 'SAMLResponse' Parameter Signature Algorithm Confusion

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 SAML Single Sign On – SSO Login是WordPress基金会的一款SAML单点登录插件。 WordPress SAML Single Sign On – SSO Login 5.4.3及之前版本存在加密问题漏洞，该漏洞源于直接从攻击者控制的SAMLResponse参数读取SignatureMethod算法属性，而不强制执行本地配置的算法，导致插件将IdP的RSA公钥重新转换为HMAC-SHA1共享秘密并验证伪造签名，这使得未经身份验证的攻击者能够伪造针对任何

CVSS 9.8 · Critical EPSS 1.50% · P73

Public Exploits 1

ExploitDB · 1 EDB-52668 [webapps]

Affected Version Matrix 1

VendorProduct Version RangeStatus
cyberlord92 SAML Single Sign On – SSO Login ≤ 5.4.3 affected
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I. Basic Information for CVE-2026-15013

Vulnerability Information
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Vulnerability Title
SAML Single Sign On <= 5.4.3 - Unauthenticated Authentication Bypass via 'SAMLResponse' Parameter Signature Algorithm Confusion
Source: CVE Program / CVE List V5
Vulnerability Description
The SAML Single Sign On – SSO Login plugin for WordPress is vulnerable to Authentication Bypass via SAML Signature Algorithm Confusion in all versions up to, and including, 5.4.3. The vulnerability exists because `Mo_SAML_Utilities::mo_saml_cast_key()` reads the `SignatureMethod` Algorithm attribute directly from the attacker-controlled `SAMLResponse` parameter rather than enforcing the locally configured algorithm, causing the plugin to recast the IdP's RSA public key as an HMAC-SHA1 shared secret and validate the forged signature against it. This makes it possible for unauthenticated attackers to forge a SAML assertion targeting any WordPress account — including administrators — obtain valid WordPress authentication cookies, and achieve full administrator-level account takeover.
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
WordPress SAML Single Sign On – SSO Login 加密问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
WordPress SAML Single Sign On – SSO Login是WordPress基金会的一款SAML单点登录插件。 WordPress SAML Single Sign On – SSO Login 5.4.3及之前版本存在加密问题漏洞，该漏洞源于直接从攻击者控制的SAMLResponse参数读取SignatureMethod算法属性，而不强制执行本地配置的算法，导致插件将IdP的RSA公钥重新转换为HMAC-SHA1共享秘密并验证伪造签名，这使得未经身份验证的攻击者能够伪造针对任何
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 ~ 5.4.3 -

II. Public POCs for CVE-2026-15013

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III. Intelligence Information for CVE-2026-15013

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Patches & Fixes for CVE-2026-15013 (1)

Vendor Advisories for CVE-2026-15013 (1)

IV. Related Vulnerabilities

Same product: SAML Single Sign On – SSO Login
Same vendor: cyberlord92
Same weakness: CWE-347

V. Comments for CVE-2026-15013

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