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CVE-2026-33439— Pre-Authentication Remote Code Execution via `jato.clientSession` Deserialization in OpenAM

Quick assessment

Affected
OpenIdentityPlatform OpenAM
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

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。

AI Predicted 9.8 Difficulty: Easy EPSS 8.43% · P95

Public Exploits 1

Nuclei · 1 CVE-2026-33439.yaml [template]
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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: CVE Program / CVE List V5
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: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
可信数据的反序列化
Source: CVE Program / CVE List V5
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

Vendor Product Affected Versions CPE Subscribe
OpenIdentityPlatform OpenAM < 16.0.6 -

II. Public POCs for CVE-2026-33439

# POC Description Source Link Shenlong Link
1 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. This vulnerability is fixed in 16.0.6. https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2026/CVE-2026-33439.yaml POC Details
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III. Intelligence Information for CVE-2026-33439

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Vendor Advisories for CVE-2026-33439 (1)

IV. Related Vulnerabilities

Same product: OpenAM
Same vendor: OpenIdentityPlatform
Same weakness: CWE-502

V. Comments for CVE-2026-33439

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