Medium · CVSS 5.0CVE-2025-11537

Keycloak-services: sensitive headers shown in the http access logsCVE-2025-11537

Answer in brief

CVE-2025-11537 records a Medium severity (CVSS 5.0) vulnerability in Keycloak-services: sensitive headers shown in the http access logs. The current sources do not mark it as known exploited. The current feed maps Red Hat/rhbk/keycloak-rhel9 (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Feb 10, 2026Updated Sep 4, 2026Source checked Oct 19, 2026First seen by HOL Aug 31, 2026Material review Sep 4, 2026

Upstream Advisory

Key facts

Risk: Medium · CVSS 5.0
Exploitation: Not marked as known exploited
Affected software: 1 mapped package or product
Fix availability: Not reported

Why this deserves its current priority

CVSS is 5.0. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Red Hat/rhbk/keycloak-rhel9 (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
Red Hat/rhbk/keycloak-rhel9generic	*	Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for Red Hat/rhbk/keycloak-rhel9.
Review the reported fix. Source-reported workaround: Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.

Evidence timeline and material changes

Published upstream
Feb 10, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Sep 4, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Aug 31, 2026

Sources and claim methodology

Upstream source 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.

Quoted source text, attributed separately from HOL analysis.