CVE-2025-11537
Medium
Description
A flaw was found in Keycloak. When the logging format is configured to a verbose, user-supplied pattern (such as the pre-defined 'long' pattern), sensitive headers including Authorization and Cookie are disclosed to the logs in cleartext. An attacker with read access to the log files can extract these credentials (e.g., bearer tokens, session cookies) and use them to impersonate users, leading to a full account compromise.
SeverityMedium
CVSS5.0
Exploit probability—
ProductOrg.keycloak:keycloak-quarkus-server
PublishedFeb 10, 2026
First seenFeb 10, 2026
Weakness typeCWE-117CWE-117
How to fix
Update
- org.keycloak:keycloak-quarkus-server26.5.6 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| org.keycloak:keycloak-quarkus-serverMaven | v < 26.5.6 | 26.5.6 |
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