Secuno
ENNL
Book demo

CVE-2026-33439

Openidentityplatform Openam remote code execution

9.8 CRITICALPublic exploitEPSS 8.43%
  1. Published7 Apr 2026

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.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

Openidentityplatform Openam< 16.0.6

Remediation

Fixed in
Openidentityplatform Openam≥ 16.0.6

References

Related CVEs

Recent high-severity vulnerabilities sharing a weakness type.

CVE-2026-1092378.1
Crawl4AI from 0.9.0 before 0.9.4 contains an untrusted-config gate bypass that allows…
CVE-2026-1093918.1
Square Squash through commit e73f280 contains an insecure deserialization vulnerability…
CVE-2026-126138.8
Deserialization of untrusted data vulnerability in Ministry of Justice General…
CVE-2026-529038.8
A deserialization of untrusted data vulnerability was found in ManageIQ. The…
CVE-2026-817979.8
Unauthenticated PHP Object Injection in Buzz Stone | Magazine & Viral Blog WordPress…
CVE-2026-785359.8
Unauthenticated PHP Object Injection in Photolia <= 1.0.3…

Frequently asked

Is CVE-2026-33439 being actively exploited?

CVE-2026-33439 is not in the CISA KEV catalog. A public exploit reference exists, so treat it as exploitable. Its EPSS exploit probability is 8.43%.

How severe is CVE-2026-33439?

CVE-2026-33439 has a CVSS 3.1 base score of 9.8, rated critical. EPSS estimates a 8.43% probability of exploitation.

Which products are affected by CVE-2026-33439?

Affected products include Openidentityplatform Openam.

How do I fix CVE-2026-33439?

Upgrade affected software to a fixed version, for example Openidentityplatform Openam 16.0.6 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-33439 against the real software inventory on every managed device, as each hourly inventory arrives. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

See how prioritisation worksBook a demo

Get Patch this first every Monday

Five vulnerabilities that matter this week, ranked on real exploitation. Plain language, one email, no spam.

You can unsubscribe with one click from every issue. We handle your details as described in our privacy policy.

Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.