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CVE-2026-123543— OpenAM before 16.1.4 Unauthenticated DoS via Unbounded Java Deserialisation

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.

OpenAM 16.1.4 之前的版本存在一个拒绝服务（DoS）漏洞，允许未认证的攻击者通过发送无大小或结构限制的序列化 Java 数据，耗尽服务器资源。攻击者可向远程 SDK 端点、经典登录页面或管理控制台发送精心构造的小型请求，从而阻断身份认证、会话验证及策略决策功能。

CVSS 7.5 · High

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service
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I. Basic Information for CVE-2026-123543

Vulnerability Information
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Vulnerability Title
OpenAM before 16.1.4 Unauthenticated DoS via Unbounded Java Deserialisation
Source: CVE Program / CVE List V5
Vulnerability Description
OpenAM before 16.1.4 contains a denial of service vulnerability that allows unauthenticated attackers to exhaust server resources by sending serialized Java data without size or structure limits. Attackers can send small crafted requests to remote SDK endpoints, classic login pages, or the administration console to block authentication, session validation and policy decisions.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
不加限制或调节的资源分配
Source: CVE Program / CVE List V5

Affected Products

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

II. Public POCs for CVE-2026-123543

# POC Description Source Link Shenlong Link
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III. Intelligence Information for CVE-2026-123543

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Other References for CVE-2026-123543 (2)

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-2026-123545 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-2026-123538 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-770