---
id: "CVE-2026-44793"
kind: "vulnerability"
aliases: ["CVE-2026-44793", "GHSA-fhrq-3gmx-p879"]
title: "OpenAM SAML2 Cluster Cookie-Hash-Redirect Path has Pre-authentication Reflected XSS via `FSUtils.postToTarget`"
severity: "high"
cvss: 7.0
epss: 0.00593
exploited: false
status: "open"
category: "package"
products: [{"name": "org.openidentityplatform.openam:openam-federation-library", "fixed": ["16.1.1"], "affected": "< 16.1.1", "ecosystem": "maven"}]
ecosystems: ["maven"]
tags: ["cwe-79", "java", "maven", "openam", "package", "saml2", "self-hosted"]
not_affected_if: ["default-config", "single-node"]
published_at: "2026-06-22T20:39:06+00:00"
first_seen_at: "2026-10-28T15:29:41+00:00"
updated_at: "2026-10-28T15:33:37+00:00"
sources: [{"source": "ghsa", "url": "https://github.com/advisories/GHSA-fhrq-3gmx-p879", "first_seen_at": "2026-10-28T15:29:41+00:00"}, {"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-44793", "first_seen_at": "2026-10-28T15:33:37+00:00"}]
---

# OpenAM SAML2 Cluster Cookie-Hash-Redirect Path has Pre-authentication Reflected XSS via `FSUtils.postToTarget`

The OpenAM federation library renders some user-supplied parameters into HTML responses without consistent output encoding on certain federation endpoints. In a non-default clustered SAML2 setup, an attacker can inject script into the OpenAM origin without logging in.

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

## Affected

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

## How to check

- Check the version of `org.openidentityplatform.openam:openam-federation-library` in your Maven dependency tree (`mvn dependency:tree | grep openam-federation-library`).
- Confirm whether SAML2 cluster cookie-hash redirect is enabled in your OpenAM configuration; the sources do not name the exact setting.

## Fix

- Upgrade `openam-federation-library` to `16.1.1` or later.

## Timeline

- 2026-10-28T15:29:41+00:00 ghsa https://github.com/advisories/GHSA-fhrq-3gmx-p879
- 2026-10-28T15:33:37+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-44793

## From the sources

Open Access Management (OpenAM) is an access management solution. Prior to 16.1.1, certain federation endpoints in a non-default clustered configuration inconsistently encode user-supplied parameters rendered into HTML in the SAML2 cluster cookie-hash redirect path. An unauthenticated attacker can induce a user to follow a crafted request and execute script in the OpenAM origin. This issue is fixed in version 16.1.1.

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