Keycloak logs sensitive headers
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.
Patches are available, see:
Affected software
Click a technology to see all vulnerabilities affecting it.
| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| Java / Kotlin (Maven) | org.keycloak:keycloak-quarkus-server | < 26.5.6 | 26.5.6 |
References
- https://nvd.nist.gov/vuln/detail/CVE-2025-11537
- https://github.com/keycloak/keycloak/commit/137a35c1109ff43a305f26264978a3ea21452373
- https://github.com/keycloak/keycloak/commit/5a3cdb7c4ccbf83ffc926f70d655a60269d7207b
- https://github.com/keycloak/keycloak/commit/9622f550a6e565b29a3a37454421f08626791a6c
- https://access.redhat.com/security/cve/CVE-2025-11537
- https://bugzilla.redhat.com/show_bug.cgi?id=2402616
- https://github.com/keycloak/keycloak
- https://www.keycloak.org/server/logging#_change_log_formatpattern
- CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:N/A:N- Weakness (CWE)
CWE-117- Platform
- Java / Kotlin (Maven)
- Package
org.keycloak:keycloak-quarkus-server- Disclosed
- 10.02.2026
- Updated
- 11.10.2026 13:20
Sources and licenses
OSV / GitHub Advisory Database - GHSA-gv3v-2cpp-3pmq - CC BY 4.0
Vulnerability history: org.keycloak:keycloak-quarkus-server
All published vulnerabilities of this package (Java / Kotlin (Maven)), newest first. Shows whether this is a one-off slip or a package that needs watching.
- Total entries
- 9
- First → latest
- 11.2024 02.2026
- Without a fix
- 1
- Exploited in attacks
- 0
Severity breakdown
- High 1
- Medium 6
- Low 2
Disclosures per year
- 2024: 3
- 2025: 4
- 2026: 2
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Keycloak logs sensitive headers this entry
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