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.
PoC: CVE-2026-33439-Python-PoC
Python PoC for CVE-2026-33439, an OpenAM pre-authentication RCE via jato.clientSession deserialization
PoC: openam-clean
CVE-2026-33439
PoC: CVE-2026-33439-Poc
PoC for CVE-2026-33439, a pre-auth RCE in OpenAM via unsafe Java deserialization.
PoC: CVE-2026-33439-PoC
CVE-2026-33439 OpenAM pre-auth RCE PoC
PoC: CVE-2026-33439
First publicly shared exploit implementation for CVE-2026-33439 (OpenAM pre-auth RCE via jato.clientSession deserialization).
PoC: CVE-2026-33439-PoC
CVE-2026-33439
PoC: CVE-2026-33439-OpenAM
Vulnerable endpoint description for CVE-2026-33439 in OpenAM
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
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