CVE-2026-33439

Critical

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.

SeverityCritical

CVSS9.8

Exploit probability—

ProductOpenidentityplatform Openam

PublishedApr 7, 2026

First seenApr 7, 2026

Weakness typeCWE-502Deserialization of untrusted data

How to fix

Update

openidentityplatform openam16.0.6 or later
org.openidentityplatform.openam:openam16.0.6 or later

Affected products

Product	Affected versions	Fixed in
openidentityplatform openam	v < 16.0.6	16.0.6
org.openidentityplatform.openam:openamMaven	v < 16.0.6	16.0.6

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