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I. Basic Information for CVE-2026-33439
Vulnerability Information
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Vulnerability Title
Pre-Authentication Remote Code Execution via `jato.clientSession` Deserialization in OpenAM
Source: NVD (National Vulnerability Database)
Vulnerability Description
Open Access Management (OpenAM) is an access management solution. Prior to 16.0.6, OpenIdentityPlatform OpenAM is vulnerable to pre-authentication Remote Code Execution (RCE) via unsafe Java deserialization of the jato.clientSession HTTP parameter. This bypasses the WhitelistObjectInputStream mitigation that was applied to the jato.pageSession parameter after CVE-2021-35464. An unauthenticated attacker can achieve arbitrary command execution on the server by sending a crafted serialized Java object as the jato.clientSession GET/POST parameter to any JATO ViewBean endpoint whose JSP contains <jato:form> tags (e.g., the Password Reset pages). This vulnerability is fixed in 16.0.6.
Source: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
可信数据的反序列化
Source: NVD (National Vulnerability Database)
Vulnerability Title
OpenAM 代码问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
OpenAM是OpenAM Consortium组织的一种一体化访问管理解决方案。提供身份验证、授权、授权和联合功能。 OpenAM 16.0.6之前版本存在代码问题漏洞，该漏洞源于jato.clientSession参数存在不安全的Java反序列化，可能导致远程代码执行。
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
VendorProductAffected VersionsCPESubscribe
OpenIdentityPlatformOpenAM < 16.0.6 -
II. Public POCs for CVE-2026-33439
#POC DescriptionSource LinkShenlong Link
1Open Access Management (OpenAM) is an access management solution. Prior to 16.0.6, OpenIdentityPlatform OpenAM is vulnerable to pre-authentication Remote Code Execution (RCE) via unsafe Java deserialization of the jato.clientSession HTTP parameter. This bypasses the WhitelistObjectInputStream mitigation that was applied to the jato.pageSession parameter after CVE-2021-35464. This vulnerability is fixed in 16.0.6. https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2026/CVE-2026-33439.yamlPOC Details
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III. Intelligence Information for CVE-2026-33439
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IV. Related Vulnerabilities
Same product: OpenAM
Same vendor: OpenIdentityPlatform
Same weakness: CWE-502
V. Comments for CVE-2026-33439

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