CVE-2026-123538— OpenAM before 16.1.4 SAML 1.x Signature Verification Issuer Impersonation

Quick assessment

Affected

OpenIdentityPlatform OpenAM

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.

在 16.1.4 版本之前的 OpenAM 未验证已签名的 SAML 1.x 断言或响应是否由其声明的发行者（即合作伙伴）签名，而是接受 OpenAM 密钥库中任何证书生成的签名。持有此类私钥的攻击者（例如受信任的 SAML 1.x 合作伙伴）可伪造断言，冒充其他合作伙伴的发行者，并以其用户身份（包括特权用户）进行登录。

CVSS 6.6 · Medium Updated Nov 08, 2026

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

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Vulnerability Information

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Vulnerability Title

OpenAM before 16.1.4 SAML 1.x Signature Verification Issuer Impersonation

Source: CVE Program / CVE List V5

Vulnerability Description

OpenAM before 16.1.4 does not verify that a signed SAML 1.x assertion or response was signed by the partner named as its issuer, accepting a signature from any certificate in OpenAM's keystore. An attacker holding such a private key, such as a trusted SAML 1.x partner, can forge assertions claiming another partner's issuer and sign in as that partner's users, including privileged ones.

Source: CVE Program / CVE List V5

CVSS Information

CVSS:3.1/AV:N/AC:H/PR:H/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

Affected Products

Vendor	Product	Affected Versions	CPE	Subscribe
OpenIdentityPlatform	OpenAM	0 ~ 16.1.4	-

II. Public POCs for CVE-2026-123538

#	POC Description	Source Link	Shenlong Link

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III. Intelligence Information for CVE-2026-123538

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Other References for CVE-2026-123538 (2)

https://github.com/OpenIdentityPlatform/OpenAM/security/advisories/GHSA-j56q-q3r3-hg7f vendor-advisory
https://www.vulncheck.com/advisories/openam-before-16.1.4-saml-1-x-signature-verification-issuer-impersonation third-party-advisory

https://www.cve.org/CVERecord?id=CVE-2026-123538

Same Patch Batch · OpenIdentityPlatform · 2026-11-08 · 18 CVEs total

CVE-2026-123551	10.0 CRITICAL	OpenAM 14.0.0 before 16.1.4 Session Token Disclosure via Notification WebSocket
CVE-2026-123550	9.8 CRITICAL	OpenAM before 16.1.4 SAML Authentication Bypass via Unsigned Assertions
CVE-2026-123549	9.8 CRITICAL	OpenAM before 16.1.4 Privilege Escalation via Self-Registration Attribute Bypass
CVE-2026-123543	7.5 HIGH	OpenAM before 16.1.4 Unauthenticated DoS via Unbounded Java Deserialisation
CVE-2026-123545	7.1 HIGH	OpenAM 14.5.1 before 16.1.4 CSRF in OAuth 2.0 Device Flow
CVE-2026-123544	6.8 MEDIUM	OpenAM before 16.1.4 Insufficient Response Validation in Internal SOAP Channel
CVE-2026-123542	6.8 MEDIUM	OpenAM before 16.1.4 PKCE Bypass in OAuth 2.0 Device Authorization Flow
CVE-2026-123553	6.5 MEDIUM	OpenAM before 16.1.4 Default Credentials in Built-in Accounts Allow Unauthenticated Login
CVE-2026-123552	6.5 MEDIUM	OpenAM before 16.1.4 SSRF and CRL Tampering via Certificate CRL Distribution Point
CVE-2026-123546	6.1 MEDIUM	OpenAM before 16.1.4 Open Redirect and XSS via goto and gotoOnFail
CVE-2026-123537	5.0 MEDIUM	OpenAM before 16.1.4 SSRF via UMA Scope Description URLs
CVE-2026-123539	4.8 MEDIUM	OpenAM before 16.1.4 Stored XSS via OAuth 2.0 Consent Page Display Name
CVE-2026-123541	4.7 MEDIUM	OpenAM before 16.1.4 Open Redirect via SAML 1.x Trusted-Partner Matching
CVE-2026-123548	4.7 MEDIUM	OpenAM before 16.1.4 Open Redirect via WS-Federation and SAML v2.0 Pages
CVE-2026-123547	4.7 MEDIUM	OpenAM before 16.1.4 Open Redirect via SAML v2.0 RelayState
CVE-2026-123536	4.1 MEDIUM	OpenAM before 16.1.4 SSRF via Federation Configuration Wizard Metadata URLs
CVE-2026-123540	2.0 LOW	OpenAM before 16.1.4 Incomplete Attribute Encoding in SAML 1.x Form POST

IV. Related Vulnerabilities

Same product: OpenAM

Same vendor: OpenIdentityPlatform

Same weakness: CWE-347