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CVE-2026-49284— SimpleSAMLphp SP accepts a response from an unexpected IdP when unsigned `Response/InResponseTo` is combined with a signed assertion lacking `SubjectConfirmationData/InResponseTo`

Quick assessment

Affected
simplesamlphp simplesamlphp
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

SimpleSAMLphp是SimpleSAMLphp组织开源的一款SAML身份验证的PHP应用程序。 SimpleSAMLphp存在输入验证错误漏洞，该漏洞源于SAML SP ACS路径未强制SP发起登录时选择的IdP，当未签名的Response/InResponseTo与缺少SubjectConfirmationData/InResponseTo的已签名断言结合时，允许一个可信IdP发出的响应被绑定到为另一个IdP创建的SP状态，并绕过将用户路由到特定IdP的流程。以下版本受到影响：2.4.7之前版本

CVSS 7.1 · High EPSS 0.22% · P12

Affected Version Matrix 2

VendorProduct Version RangeStatus
simplesamlphp simplesamlphp < 2.4.7 affected
>= 2.5.0-rc1, < 2.5.2 affected
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I. Basic Information for CVE-2026-49284

Vulnerability Information
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Vulnerability Title
SimpleSAMLphp SP accepts a response from an unexpected IdP when unsigned `Response/InResponseTo` is combined with a signed assertion lacking `SubjectConfirmationData/InResponseTo`
Source: CVE Program / CVE List V5
Vulnerability Description
SimpleSAMLphp versions before 1.18.6 contain an information disclosure vulnerability. Prior to 2.4.7 and 2.5.2, SimpleSAMLphp's SAML SP ACS path does not enforce the IdP selected for an SP-initiated login when unsigned Response/InResponseTo is combined with a signed assertion lacking SubjectConfirmationData/InResponseTo, allowing a response issued by one trusted IdP to be bound to SP state created for another IdP and bypass flows that route users to a specific IdP, including deployments that set enable_unsolicited to false. This issue is fixed in versions 2.4.7 and 2.5.2.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
对数据真实性的验证不充分
Source: CVE Program / CVE List V5
Vulnerability Title
SimpleSAMLphp 输入验证错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
SimpleSAMLphp是SimpleSAMLphp组织开源的一款SAML身份验证的PHP应用程序。 SimpleSAMLphp存在输入验证错误漏洞，该漏洞源于SAML SP ACS路径未强制SP发起登录时选择的IdP，当未签名的Response/InResponseTo与缺少SubjectConfirmationData/InResponseTo的已签名断言结合时，允许一个可信IdP发出的响应被绑定到为另一个IdP创建的SP状态，并绕过将用户路由到特定IdP的流程。以下版本受到影响：2.4.7之前版本
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
simplesamlphp simplesamlphp < 2.4.7 -

II. Public POCs for CVE-2026-49284

# POC Description Source Link Shenlong Link
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Qwen3.6-35B-A3B · 9757 chars
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III. Intelligence Information for CVE-2026-49284

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Vendor Advisories for CVE-2026-49284 (1)

Vendor Pages for CVE-2026-49284 (1)

IV. Related Vulnerabilities

Same product: simplesamlphp
Same vendor: simplesamlphp
Same weakness: CWE-345

V. Comments for CVE-2026-49284

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