---
id: "CVE-2026-45049"
kind: "vulnerability"
aliases: ["CVE-2026-45049", "GHSA-r9pv-5rpp-vm8g"]
title: "OpenAM Unauthenticated Session Hijacking via Information Exposure in CDCServlet"
severity: "high"
cvss: 8.3
epss: null
exploited: false
status: "open"
category: "package"
products: [{"name": "org.openidentityplatform.openam:openam-federation", "fixed": ["16.1.1"], "affected": "<= 16.0.6", "ecosystem": "maven"}]
ecosystems: ["maven"]
tags: ["cwe-201", "java", "multi-domain", "openam", "package", "self-hosted", "sso"]
not_affected_if: ["cdsso-disabled", "patched-16.1.1"]
published_at: "2026-06-23T17:33:14+00:00"
first_seen_at: "2026-10-28T15:34:52+00:00"
updated_at: "2026-10-28T15:35:09+00:00"
sources: [{"source": "ghsa", "url": "https://github.com/advisories/GHSA-r9pv-5rpp-vm8g", "first_seen_at": "2026-10-28T15:34:52+00:00"}]
---

# OpenAM Unauthenticated Session Hijacking via Information Exposure in CDCServlet

OpenAM's Cross-Domain Single Sign-On servlet sends a logged-in user's raw session token via POST to an attacker-chosen URL. An attacker who lures a victim to a crafted link can take over the victim's session.

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

## Affected

- maven:org.openidentityplatform.openam:openam-federation affected <= 16.0.6 fixed 16.1.1

## How to check

- Check the `openam-federation` Maven dependency version; affected if at or below `16.0.6`
- Check whether CDSSO is enabled in the OpenAM configuration (the sources do not name the exact setting)

## Fix

- Upgrade `openam-federation` (OpenAM Community Edition) to `16.1.1`

## Timeline

- 2026-10-28T15:34:52+00:00 ghsa https://github.com/advisories/GHSA-r9pv-5rpp-vm8g

## From the sources

## Summary

**Description**

An Information Exposure Through Sent Data (CWE-201) issue in OpenAM's Cross-Domain Single Sign-On (CDSSO) servlet allows a logged-in user's raw OpenAM session token to be POSTed to an attacker-controlled URL. This impacts OpenAM Community Edition through version 16.0.6. This issue was patched in version 16.1.1.

An attacker who can induce a logged-in victim to visit a crafted URL may receive the victim's session credential, which could enable session hijacking.

## Impact
OpenAM deployments through version 16.0.6 that have CDSSO enabled are potentially affected. The CDSSO component is commonly enabled in multi-domain deployments. Exploitation requires user interaction — an authenticated user must be induced to visit an attacker-crafted URL — and is further gated on a non-default configuration being absent.

## Patch
This has been patched in OpenAM Community Edition version 16.1.1. Users are encouraged to update to the latest release.

---

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