CVE-2026-123542— OpenAM before 16.1.4 PKCE Bypass in OAuth 2.0 Device Authorization Flow

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 中，OAuth 2.0 设备授权流程未能正确实施 PKCE（证明密钥交换代码），在将设备代码交换为令牌时从未验证 code verifier（代码验证器）。攻击者若从客户端日志或共享设备存储中获取已批准的设备代码，即可将其兑换为访问令牌（access token）和 ID 令牌（ID token），从而冒充用户。

CVSS 6.8 · 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 PKCE Bypass in OAuth 2.0 Device Authorization Flow

Source: CVE Program / CVE List V5

Vulnerability Description

OpenAM before 16.1.4 fails to enforce PKCE in the OAuth 2.0 device authorization flow, never validating the code verifier when device codes are exchanged for tokens. Attackers who obtain an approved device code from client logs or shared device storage can redeem it for access and ID tokens to impersonate the user.

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:N

Source: CVE Program / CVE List V5

Vulnerability Type

不恰当实现的标准安全检查

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-2026-123542

#	POC Description	Source Link	Shenlong Link

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III. Intelligence Information for CVE-2026-123542

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Other References for CVE-2026-123542 (2)

https://github.com/OpenIdentityPlatform/OpenAM/security/advisories/GHSA-h93p-35jm-rj83 vendor-advisory
https://www.vulncheck.com/advisories/openam-before-16.1.4-pkce-bypass-in-oauth-2.0-device-authorization-flow third-party-advisory

https://www.cve.org/CVERecord?id=CVE-2026-123542

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-2026-123538	6.6 MEDIUM	OpenAM before 16.1.4 SAML 1.x Signature Verification Issuer Impersonation
CVE-2026-123552	6.5 MEDIUM	OpenAM before 16.1.4 SSRF and CRL Tampering via Certificate CRL Distribution Point
CVE-2026-123553	6.5 MEDIUM	OpenAM before 16.1.4 Default Credentials in Built-in Accounts Allow Unauthenticated Login
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-358