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10.0

Apache Juneau logs authentication headers in clear text on errors

CVE-2026-73100 · published 4 days ago
Summary

When Apache Juneau encounters a server error, it writes the full request headers—including passwords, cookies and API keys—to its log files without hiding them. Anyone who can read those logs could see sensitive credentials. Upgrade to version 9.2.1 or later to stop this logging behavior.

What to do
  • Update apache software foundation apache juneau to version 9.2.1 or later.
Affected software
VendorProductAffected versions
apache software foundation apache juneau < 9.2.1
Original advisory text
Apache Juneau: Sensitive request headers logged in cleartext by the default request logger on server errors
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.
References
Fix within
Internet-facing 3 days
Internal 60 days
  • Not known to be exploited
  • Can be exploited automatically (estimated)
  • Gives an attacker full control (estimated)
Severity
10.0 Critical
Exploitation
<1% chance of attack within 30 days
Type
CWE-532Insertion of Sensitive Information into Log File
Timeline
Published5 Nov 2026
Updated6 Nov 2026
First seen5 Nov 2026
Sources
CVE-2026-73100 · NVD
CVE-2026-73100 · MITRE
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