---
id: "CVE-2026-73116"
kind: "vulnerability"
aliases: ["CVE-2026-73116"]
title: "Apache Juneau: RestClient leaks credential headers across redirects to other hosts"
severity: "critical"
cvss: 10.0
epss: null
exploited: false
status: "open"
category: "package"
products: []
ecosystems: []
tags: ["apache-juneau", "java", "package", "rest-client"]
not_affected_if: ["does-not-use-restclient", "version-9.2.1-or-later"]
published_at: "2026-11-05T12:17:51+00:00"
first_seen_at: "2026-11-05T12:38:48+00:00"
updated_at: "2026-11-05T12:40:01+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-73116", "first_seen_at": "2026-11-05T12:38:48+00:00"}]
exploit_sources: []
---

# Apache Juneau: RestClient leaks credential headers across redirects to other hosts

Apache Juneau's RestClient kept Authorization, Cookie, Proxy-Authorization and X-API-Key headers when following HTTP redirects. A server that redirects the client to another host, port, or from HTTPS to HTTP can read those credentials.

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

## How to check

- Look for Apache Juneau in the project's dependencies, for example the `juneau-rest-client` artifact, and note its version.
- Check whether the application builds its clients with the RestClient builder or supplies its own HttpClient.

## Fix

- Apache Juneau: upgrade to `9.2.1`.
- Applications that supply their own HttpClient: disable automatic redirects or strip credential headers on cross-origin redirects, per the advisory.

## Timeline

- 2026-11-05T12:38:48+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-73116

## From the sources

Insufficiently Protected Credentials vulnerability in Apache Juneau.

The Apache Juneau RestClient followed HTTP redirects while keeping credential headers from the original request, so a server that redirected the client to a different host or port, or from HTTPS to HTTP, could receive headers such as Authorization, Cookie, Proxy-Authorization and X-API-Key.

This issue affects Apache Juneau: through 9.2.0.

Users are recommended to upgrade to version 9.2.1, which fixes the issue. The fix applies to HTTP clients created by the RestClient builder; applications that supply their own HttpClient must disable automatic redirects or strip credential headers on cross-origin redirects themselves.

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