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CVE

CVE-2026-33439

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

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.

Package Versions Affected

Package Version
patch Availability
No items found.

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CVSS Version

Severity
Base Score
CVSS Version
Score Vector
C
H
U
9.3
-
4.0
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
C
H
U
0
-
C
H
U
-

Related Resources

No items found.

References

https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/33xxx/CVE-2026-33439.json, https://github.com/OpenIdentityPlatform/OpenAM/security/advisories/GHSA-2cqq-rpvq-g5qj, https://nvd.nist.gov/vuln/detail/CVE-2026-33439

Severity

0

CVSS Score
0
10

Basic Information

Base CVSS
0
EPSS Probability
0.1049%
EPSS Percentile
0.954%
Introduced Version
0
Fix Available
4529f108e9f5d3b8f98b4afb3dd035a3c4d73a1b

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