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TI-2026-25836 Aliases CVE-2026-33439GHSA-2cqq-rpvq-g5qj

Pre-Authentication Remote Code Execution via `jato.clientSession` Deserialization in OpenAM

Priority MEDIUM 60CWE-502Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Attack requirements
None
Impact type
Code execution
Confidentiality · integrity · availability
High · High · High
Fix status
Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA and GitHub. Impact type from CWE-502.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.09333 95th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Fixed OpenAM (OpenIdentityPlatform): 16.0.6org.openidentityplatform.openam:openam (Maven): 16.0.6

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
Yes
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
OpenIdentityPlatformOpenAMbefore 16.0.616.0.6Patch availableCNA
—org.openidentityplatform.openam:openam (Maven)before 16.0.616.0.6Patch availableGHSA-2cqq-rpvq-g5qj
  • OpenAM VendorOpenIdentityPlatform Affected before 16.0.6 Fixed in 16.0.6 Patch available CNA
  • org.openidentityplatform.openam:openam (Maven) Vendor— Affected before 16.0.6 Fixed in 16.0.6 Patch available GHSA-2cqq-rpvq-g5qj

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:openidentityplatform:openam:*:*:*:*:*:*:*:*before 16.0.6VulnerableOpenIdentityPlatform
  • cpe:2.3:a:openidentityplatform:openam:*:*:*:*:*:*:*:* Versions before 16.0.6 Vulnerable ·OpenIdentityPlatform

Remediation

  • Fix · CNA OpenAM (OpenIdentityPlatform) Fixed in 16.0.6
  • Fix · GHSA-2cqq-rpvq-g5qj org.openidentityplatform.openam:openam (Maven) Fixed in 16.0.6 Advisory →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-33439
  2. 2026-10-03 Alias added: GHSA-2cqq-rpvq-g5qj
  3. 2026-10-25 EPSS moved to the 95th–99th percentile

References

Exploit 1

Advisory 1

Other 3

  • TI-2023-19079 User impersonation using SAMLv1.x SSO in Open Access Management CVSS 3.1CRITICAL 9.8
  • TI-2022-15210 The NT auth module in OpenAM before 14.6.6 allows a "replace Samba username attack." CVSS 3.1MEDIUM 5.3

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences