CVE-2025-11537

Credential disclosure via unmasked HTTP access logs

Published Feb 10, 2026 · Updated Feb 10, 2026

Cleartext credential logging in Red Hat build of Keycloak allows local users to obtain bearer tokens and session cookies from HTTP access logs. The HTTP access-log formatter emits Authorization header values and sensitive Keycloak cookie values without masking when the long pattern or a header-printing custom pattern is enabled. HTTP access logging is disabled by default; exploitation requires requests carrying credentials and read access to the resulting logs, after which exposed credentials allow account impersonation.

CVSS severity5.0
Medium
EPSS probability0.15%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Cleartext credential logging in Red Hat build of Keycloak allows local users to obtain bearer tokens and session cookies from HTTP access logs. The HTTP access-log formatter emits Authorization header values and sensitive Keycloak cookie values without masking when the long pattern or a header-printing custom pattern is enabled. HTTP access logging is disabled by default; exploitation requires requests carrying credentials and read access to the resulting logs, after which exposed credentials allow account impersonation.

The record

CVE
CVE-2025-11537
Published
Feb 10, 2026
Updated
Feb 10, 2026
Vendor
389 Directory Server
Product
Red Hat build of Keycloak
Classifications
CWE-117, T1555.003, T1552.001
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 10, 2026CVE publishedPublication date reported by the CVE source.
  2. Feb 10, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected versions are unavailable in this record. Check the vendor advisory for version and patch details.

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

389 Directory Server · Red Hat build of KeycloakAffected versions are unavailable in this record.

Published CVSS scores

5.0Red Hat, Inc.CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:N/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-117Improper Output Neutralization for Logs
T1555.003Credentials from Password Stores: Credentials from Web Browsers
T1552.001Unsecured Credentials: Credentials In Files

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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