---
id: "CVE-2026-73100"
kind: "vulnerability"
aliases: ["CVE-2026-73100"]
title: "Apache Juneau: default REST logger writes auth headers to logs on server errors"
severity: "critical"
cvss: 10.0
epss: null
exploited: false
status: "open"
category: "package"
products: []
ecosystems: []
tags: ["apache-juneau", "java", "logging", "package", "rest-server"]
not_affected_if: ["default-config", "no-juneau-rest-server"]
published_at: "2026-11-05T12:17:51+00:00"
first_seen_at: "2026-11-05T12:38:47+00:00"
updated_at: "2026-11-05T12:40:04+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-73100", "first_seen_at": "2026-11-05T12:38:47+00:00"}]
exploit_sources: []
---

# Apache Juneau: default REST logger writes auth headers to logs on server errors

The default REST server call logger records request headers such as Authorization, Cookie and X-API-Key in cleartext for requests that end in a server error. Anyone who can read the application logs can take those credentials and reuse them.

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

## How to check

- Check the Apache Juneau version in your build file, such as `juneau` in your Maven or Gradle dependencies.
- Look in the application logs for the header names Authorization, Cookie or X-API-Key appearing next to server error entries.

## Fix

- Apache Juneau through `9.2.0`: upgrade to `9.2.1`.

## Timeline

- 2026-11-05T12:38:47+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-73100

## From the sources

Insertion of Sensitive Information into Log File vulnerability in Apache Juneau.

The default REST server call logger records request headers for requests that end in a server error, without redacting them. Any client able to cause a server error gets headers such as Authorization, Cookie, Proxy-Authorization and X-API-Key written in cleartext to the application log, exposing them to anyone who can read the logs.

This issue affects Apache Juneau: through 9.2.0.

Users are recommended to upgrade to version 9.2.1, which fixes the issue.

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