CVE-2026-33439 Details
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.
A pre-authentication remote code execution vulnerability has been identified in OpenIdentityPlatform OpenAM versions prior to 16.0.6. The issue arises from unsafe deserialization of the 'jato.clientSession' HTTP parameter, which bypasses a mitigation applied to the 'jato.pageSession' parameter in response to a previous vulnerability (CVE-2021-35464). An unauthenticated attacker can exploit this flaw by sending a crafted serialized Java object as the 'jato.clientSession' parameter to any JATO ViewBean endpoint that includes '<jato:form>' tags, such as the Password Reset pages. This exploitation allows for arbitrary command execution on the server.
Users are advised to update to OpenIdentityPlatform OpenAM version 16.0.6 or later. Additionally, apply 'WhitelistObjectInputStream' filtering to 'ClientSession.deserializeAttributes()' to match the mitigation already implemented for 'ConsoleViewBeanBase.deserializePageAttributes()'. Audit all calls to 'Encoder.deserialize()' for user-controlled input and consider adding a JVM-wide JEP 290 deserialization filter as an additional layer of defense.
Metrics
CVSS 4.0 Severity and Vector Strings:
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
CISA-ADP
Assessed Apr 8, 2026References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://github.com/OpenIdentityPlatform/OpenAM/security/advisories/GHSA-2cqq-rpvq-g5qj | [email protected] | ExploitVendor Advisory |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-502 | Deserialization of Untrusted Data | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| openidentityplatform openam | < 16.0.6 |
CPE
Remediation
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Change History
6 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jul 24, 2026 | CVE Translated | [email protected] |
| Jul 24, 2026 | CVE Translated | [email protected] |
| Jun 17, 2026 | CVE Modified | [email protected] |
| Jun 17, 2026 | CVE Modified | CISA-ADP |
| Apr 15, 2026 | Initial Analysis | [email protected] |
| Apr 7, 2026 | New CVE Received | [email protected] |