CVE-2026-53660: Openam core OpenAM Insecure SSO Cookie Initialization Vulnerability

HIGH
Advisory Identifier: GHSA-fpmh-vx4h-xc33
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CWE-1275 CWE-1188 CWE-1004
Published
Advisory Summary

CVE-2026-53660 is a HIGH openam insecure sso cookie initialization vulnerability (CWE-1275: Sensitive Cookie with Improper SameSite Attribute) affecting Openam core libraries in the Maven ecosystem. The issue involves openam insecure sso cookie initialization. Remediation is available by upgrading affected packages to version 16.1.1.

CVE-2026-53660 at a Glance

CVE Identifier CVE-2026-53660
GHSA Identifier GHSA-fpmh-vx4h-xc33
Severity HIGH
CVSS v3.1 Base Score N/A
CWE Classification CWE-1275: Sensitive Cookie with Improper SameSite Attribute
Affected Product Openam core
Package Ecosystem Maven
Published Date
Last Updated

How to Fix CVE-2026-53660

To remediate this vulnerability, upgrade all affected Openam core dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

org.openidentityplatform.openam:openam-core fixed: 16.1.1 
<dependency>
    <groupId>org.openidentityplatform.openam</groupId>
    <artifactId>openam-core</artifactId>
    <version>16.1.1</version>
</dependency>
Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

mvn dependency:tree -Dincludes=org.openidentityplatform.openam

How to Check if You Are Affected

To determine whether your Java application is affected by CVE-2026-53660, inspect your build dependencies using the Maven Dependency Plugin:

mvn dependency:tree -Dincludes=org.openidentityplatform.openam

Analyze the terminal output to locate any version of Openam core in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 16.1.1), your application is affected.

Note: The mvn dependency:tree -Dincludes=org.openidentityplatform.openam command inspects the resolved dependency graph declared in your project's POM files; it does not perform automated security scanning or inspect runtime dynamic classpaths. Always verify runtime container classpaths and shaded JARs.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-1275: Sensitive Cookie with Improper SameSite Attribute, where the samesite attribute for sensitive cookies is not set, or an insecure value is used. In Openam core, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

## Summary **Description** An Insecure Default Initialization of Resource (CWE-1188) issue in the OpenAM default configuration ships the `iPlanetDirectoryPro` SSO cookie with `HttpOnly=false`. Also, the `iPlanetDirectoryPro` SSO cookie is used as a CSRF token in OAuth/OIDC flows. This affects OpenAM Community Edition through version 16.0.6 and was patched in version 16.1.1. ## Impact A single click on an attacker link may yield full SSO session theft of any authenticated console user when chained with any other same-origin XSS in the OpenAM origin. The missing `SameSite` default also widens the CSRF surface. Also, because the consent flow reuses the SSO cookie as its CSRF token, any XSS in the OpenAM origin both steals the session and completes attacker-driven OAuth consent grants in one step. ## Patch This has been patched in OpenAM Community Edition version 16.1.1. Users are encouraged to update to the latest release.

CVE-2026-53660 Affected Openam core Versions

1 component(s)
Fixed Versions:
16.1.1
Product / Package Ecosystem Affected Versions Fixed Version
org.openidentityplatform.openam:openam-core
maven/org.openidentityplatform.openam/openam-core
Maven
< 16.1.1
16.1.1

References

GitHub Advisory / Wiki ADVISORY
https://github.com/OpenIdentityPlatform/OpenAM/security/advisories/GHSA-fpmh-vx4h-xc33
Openam core Source Repository REPOSITORY
https://github.com/OpenIdentityPlatform/OpenAM
Openam core Release RELEASE
https://github.com/OpenIdentityPlatform/OpenAM/releases/tag/16.1.1

Frequently Asked Questions

What is CVE-2026-53660?
CVE-2026-53660 is a security vulnerability in Openam core involving OpenAM Insecure SSO Cookie Initialization under CWE-1275: Sensitive Cookie with Improper SameSite Attribute.
Which Openam core versions are affected?
Affected versions include releases prior to 16.1.1 across affected packages: org.openidentityplatform.openam:openam-core.
What version fixes CVE-2026-53660?
Upgrading to 16.1.1 (or the latest patched release for your respective branch) resolves the vulnerability.
Is openam-core affected?
Yes, org.openidentityplatform.openam:openam-core is affected in releases prior to 16.1.1. Upgrade your dependency to 16.1.1 or later.
What CWE is associated with CVE-2026-53660?
CVE-2026-53660 is classified under CWE-1275: Sensitive Cookie with Improper SameSite Attribute (The SameSite attribute for sensitive cookies is not set, or an insecure value is used.).
How can I check Maven dependencies for CVE-2026-53660?
Run the dependency tree command: 'mvn dependency:tree -Dincludes=org.openidentityplatform.openam'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-fpmh-vx4h-xc33",
  "modified" : "2026-08-14T19:25:57Z",
  "published" : "2026-08-14T19:25:57Z",
  "aliases" : [ "CVE-2026-53660" ],
  "summary" : "OpenAM Insecure SSO Cookie Initialization",
  "details" : "## Summary\n\n**Description**\nAn Insecure Default Initialization of Resource (CWE-1188) issue in the OpenAM default configuration ships the `iPlanetDirectoryPro` SSO cookie with `HttpOnly=false`. Also, the `iPlanetDirectoryPro` SSO cookie is used as a CSRF token in OAuth/OIDC flows. This affects OpenAM Community Edition through version 16.0.6 and was patched in version 16.1.1.\n\n## Impact\nA single click on an attacker link may yield full SSO session theft of any authenticated console user when chained with any other same-origin XSS in the OpenAM origin. The missing `SameSite` default also widens the CSRF surface. Also, because the consent flow reuses the SSO cookie as its CSRF token, any XSS in the OpenAM origin both steals the session and completes attacker-driven OAuth consent grants in one step.\n\n## Patch\nThis has been patched in OpenAM Community Edition version 16.1.1. Users are encouraged to update to the latest release.",
  "severity" : [ {
    "type" : "CVSS_V4",
    "score" : "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Maven",
      "name" : "org.openidentityplatform.openam:openam-core"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "16.1.1"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/OpenIdentityPlatform/OpenAM/security/advisories/GHSA-fpmh-vx4h-xc33"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/OpenIdentityPlatform/OpenAM"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/OpenIdentityPlatform/OpenAM/releases/tag/16.1.1"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-1004", "CWE-1188", "CWE-1275" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-08-14T19:25:57Z",
    "nvd_published_at" : null
  }
}