CVE-2026-33439
Pre-Authentication Remote Code Execution via `jato.clientSession` Deserialization in OpenAM
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.
| CWE | CWE-502 |
| Vendor | openidentityplatform |
| Product | openam |
| Published | Apr 7, 2026 |
| Last Updated | Apr 8, 2026 |
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