CVE-2026-44203— OpenAM: Pre-auth Reflected XSS in OAuth2 / OIDC response_mode=form_post via state parameter (FormPostResponse.ftl)
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.
Open Access Management（OpenAM）是一款访问管理解决方案。在 16.1.1 版本之前，OAuth 2.0 和 OpenID Connect 的授权端点在 响应模式下，未对用户提供的参数进行充分编码，导致 和 在将参数渲染为 HTML 时存在安全风险。未认证的恶意攻击者可以诱导用户打开一个精心构造的授权请求，从而在 OpenAM 来源下执行脚本（即存在 XSS 风险）。该问题已在 16.1.1 版本中修复。
Possible ATT&CK Techniques 3 AI
T1059.007 · JavaScript T1190 · Exploit Public-Facing Application T1059 · Command and Scripting Interpreter
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I. Basic Information for CVE-2026-44203
Vulnerability Information
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Vulnerability Title
OpenAM: Pre-auth Reflected XSS in OAuth2 / OIDC response_mode=form_post via state parameter (FormPostResponse.ftl)
Source: CVE Program / CVE List V5
Vulnerability Description
Open Access Management (OpenAM) is an access management solution. Prior to 16.1.1, the OAuth 2.0 and OpenID Connect authorization endpoint does not sufficiently encode user-supplied parameters before FormPostResponse.ftl and checkSession.ftl render them into HTML for the form_post response mode. An unauthenticated attacker can induce a user to open a crafted authorization request and execute script in the OpenAM origin. This issue is fixed in version 16.1.1.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:L/VI:H/VA:N/SC:L/SI:H/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
在Web页面生成时对输入的转义处理不恰当(跨站脚本)
Source: CVE Program / CVE List V5
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| OpenIdentityPlatform | OpenAM | < 16.1.1 | - |
|
II. Public POCs for CVE-2026-44203
| # | POC Description | Source Link | Shenlong Link |
|---|
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Patches & Fixes for CVE-2026-44203 (1)
Vendor Advisories for CVE-2026-44203 (1)
Vendor Pages for CVE-2026-44203 (1)
Same Patch Batch · OpenIdentityPlatform · 2026-09-15 · 18 CVEs total
| CVE-2026-62379 | 9.8 CRITICAL | OpenAM: Unauthenticated Remote Code Execution via Class.forName in AuthXMLUtils.createCust |
| CVE-2026-46619 | 9.3 CRITICAL | OpenAM Authentication Bypass via MSISDN LDAP Injection |
| CVE-2026-45052 | 9.3 CRITICAL | OpenAM Pre-auth User Profile Tampering via Anonymous SOAP Authn in Liberty IDPP/Discovery |
| CVE-2026-45051 | 9.2 CRITICAL | OpenAM Pre-auth RCE via Java Deserialization in WebAuthn Authenticator Storage |
| CVE-2026-62263 | 9.2 CRITICAL | OpenAM: WebAuthn Java deserialization RCE via ObjectInputFilter depth>1 bypass |
| CVE-2026-48717 | 9.1 CRITICAL | OpenAM OAuth Authorization Bypass via PKCE Challenge |
| CVE-2026-45048 | 8.5 HIGH | OpenAM Authenticated Privilege Escalation via Raw Token Disclosure Session RPC |
| CVE-2026-45794 | 7.7 HIGH | OpenAM Unsafe Java Deserialization via SNS |
| CVE-2026-47426 | 7.6 HIGH | OpenAM OAuth Client Impersonation via JWKS Resolver Cache |
| CVE-2026-46498 | 7.6 HIGH | OpenAM Arbitrary OAuth Token Minting via Push Registration |
| CVE-2026-47424 | 7.5 HIGH | OpenAM Authenticated RCE via Groovy Sandbox Escape |
| CVE-2026-53660 | 7.4 HIGH | OpenAM Insecure SSO Cookie Initialization |
| CVE-2026-46623 | 7.4 HIGH | OpenAM Account Takeover via Unverified Password Change in OAuth2 Module |
| CVE-2026-41573 | 7.1 HIGH | OpenAM LDAP Injection via `_queryId` Parameter |
| CVE-2026-44793 | 7.0 HIGH | OpenAM: Pre-authentication Reflected XSS in SAML2 Cluster Cookie-Hash-Redirect Path via `F |
| CVE-2026-62280 | 6.1 MEDIUM | OpenAM Reflected XSS in the OAuth2/OIDC `wap` consent page |
| CVE-2026-44202 | 5.3 MEDIUM | OpenAM Authenticated Server-Side Request Forgery (SSRF) via `/sessionservice` |
IV. Related Vulnerabilities
Same product: OpenAM
-
CVE-2026-48717
OpenAM OAuth Authorization Bypass via PKCE Challenge -
CVE-2026-47426
OpenAM OAuth Client Impersonation via JWKS Resolver Cache -
CVE-2026-47424
OpenAM Authenticated RCE via Groovy Sandbox Escape -
CVE-2026-41573
OpenAM LDAP Injection via `_queryId` Parameter -
CVE-2026-62280
OpenAM Reflected XSS in the OAuth2/OIDC `wap` consent page
Same vendor: OpenIdentityPlatform
-
CVE-2026-48717
OpenAM OAuth Authorization Bypass via PKCE Challenge -
CVE-2026-47426
OpenAM OAuth Client Impersonation via JWKS Resolver Cache -
CVE-2026-47424
OpenAM Authenticated RCE via Groovy Sandbox Escape -
CVE-2026-41573
OpenAM LDAP Injection via `_queryId` Parameter -
CVE-2026-62280
OpenAM Reflected XSS in the OAuth2/OIDC `wap` consent page
Same weakness: CWE-79
-
CVE-2026-91922
Steedos Platform through 3.0.15-beta.47 Reflected XSS via pa -
CVE-2026-62280
OpenAM Reflected XSS in the OAuth2/OIDC `wap` consent page -
CVE-2026-44793
OpenAM: Pre-authentication Reflected XSS in SAML2 Cluster Co -
CVE-2026-18063
Job Postings <= 2.8.1 - Authenticated (Contributor+) Stored -
CVE-2026-15402
Eventin <= 4.1.23 - Authenticated (Custom+) Stored Cross-Sit
V. Comments for CVE-2026-44203
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