---
id: "CVE-2026-53660"
kind: "vulnerability"
aliases: ["CVE-2026-53660", "GHSA-fpmh-vx4h-xc33"]
title: "OpenAM Insecure SSO Cookie Initialization"
severity: "high"
cvss: 7.4
epss: 0.00409
exploited: false
status: "open"
category: "package"
products: [{"name": "org.openidentityplatform.openam:openam-core", "fixed": ["16.1.1"], "affected": "< 16.1.1", "ecosystem": "maven"}]
ecosystems: ["maven"]
tags: ["cwe-1004", "cwe-1188", "cwe-1275", "java", "maven", "openam", "package", "self-hosted", "sso"]
not_affected_if: ["no-authenticated-console-users", "version-16.1.1-or-later"]
published_at: "2026-08-14T19:25:57+00:00"
first_seen_at: "2026-10-28T15:34:52+00:00"
updated_at: "2026-10-28T16:04:30+00:00"
sources: [{"source": "ghsa", "url": "https://github.com/advisories/GHSA-fpmh-vx4h-xc33", "first_seen_at": "2026-10-28T15:34:52+00:00"}, {"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-53660", "first_seen_at": "2026-10-28T16:04:30+00:00"}]
---

# OpenAM Insecure SSO Cookie Initialization

OpenAM Community Edition ships its iPlanetDirectoryPro SSO cookie without HttpOnly by default, so any script running in the OpenAM origin can read it. Combined with an XSS flaw, an attacker can steal an authenticated console session and complete OAuth consent grants.

_Summary, check and fix written by a model from the sources; labelled as such._

## Affected

- maven:org.openidentityplatform.openam:openam-core affected < 16.1.1 fixed 16.1.1

## How to check

- Check the openam-core version in the Maven build file or dependency tree against `16.1.1`
- Inspect the Set-Cookie header for `iPlanetDirectoryPro` in a login response and confirm whether `HttpOnly` is present

## Fix

- Upgrade `org.openidentityplatform.openam:openam-core` to `16.1.1` or later

## Timeline

- 2026-10-28T15:34:52+00:00 ghsa https://github.com/advisories/GHSA-fpmh-vx4h-xc33
- 2026-10-28T16:04:30+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-53660

## From the sources

## 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.

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_Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai_