CVE-2026-13463: IBM Cloud Pak System Info Disclosure Flaw

CVE-2026-13463 Overview

CVE-2026-13463 affects IBM Cloud Pak System 2.3.5.0. The vulnerability allows a local attacker to obtain sensitive information because the product inserts credentials into log files. This is an information disclosure weakness classified under [CWE-798] (Use of Hard-coded Credentials). IBM has published a support advisory acknowledging the flaw.

The issue stems from insecure logging practices that persist authentication material in plaintext on disk. Any user or process with read access to the affected log files can harvest credentials and reuse them against IBM Cloud Pak System components.

Critical Impact
Credentials written to log files can be recovered by local users, enabling account takeover and lateral movement within IBM Cloud Pak System deployments.

Affected Products

IBM Cloud Pak System 2.3.5.0
IBM Cloud Pak System deployments that generate the affected log output
Environments where log files are accessible to non-privileged local accounts

Discovery Timeline

2026-07-28 - CVE-2026-13463 published to NVD
2026-07-30 - Last updated in NVD database

Technical Details for CVE-2026-13463

Vulnerability Analysis

The vulnerability is an information disclosure flaw in IBM Cloud Pak System 2.3.5.0. During normal operation, the product writes credential data into log files as part of routine event or debug output. These log entries persist on the filesystem and are readable by local accounts with access to the log directory.

Although classified under [CWE-798], the practical exposure is credential leakage through logging rather than hardcoded secrets in source. An attacker who has already achieved local access — for example a low-privileged operator, service account, or compromised container — can parse the logs and extract credentials to escalate privileges or move laterally.

The EPSS model estimates a low near-term exploitation probability, but the impact on confidentiality is high because leaked credentials directly authenticate against IBM Cloud Pak System services.

Root Cause

The root cause is improper handling of sensitive data during log generation. Application code paths emit credential material — likely authentication tokens, service passwords, or API keys — without redaction or masking. Combined with default log file permissions that allow local read access, this produces a durable exposure of secrets.

Attack Vector

Exploitation requires local access to the host or container running IBM Cloud Pak System 2.3.5.0. The attacker locates the relevant log files, searches for credential patterns, and extracts the plaintext values. No user interaction and no exploitation tooling are required. Refer to the IBM Support Page for vendor-specific file paths and remediation details.

Detection Methods for CVE-2026-13463

Indicators of Compromise

Log files under IBM Cloud Pak System directories containing plaintext credential strings such as password=, token=, or Authorization: headers.
Unexpected read access on log files by non-administrative local accounts or service identities.
Authentication events from accounts whose credentials appeared in log output, originating from unusual hosts.

Detection Strategies

Scan IBM Cloud Pak System log directories for regex patterns matching credentials, bearer tokens, or base64-encoded authentication headers.
Correlate successful logins with prior log-file access events on the same host to identify credential harvesting.
Alert on file access to Cloud Pak System log paths by identities outside an approved administrator list.

Monitoring Recommendations

Forward IBM Cloud Pak System audit and access logs to a centralized SIEM with retention sufficient for post-incident review.
Monitor for read operations against log files by non-root, non-service accounts using file integrity or auditd rules.
Track credential reuse across systems by baselining authentication source hosts for privileged Cloud Pak accounts.

How to Mitigate CVE-2026-13463

Immediate Actions Required

Apply the fix referenced on the IBM Support Page for IBM Cloud Pak System 2.3.5.0.
Rotate all credentials, tokens, and service passwords that may have been written to affected log files.
Restrict filesystem permissions on Cloud Pak System log directories to administrative accounts only.
Purge or archive historical log files that contain exposed credentials after collecting forensic copies.

Patch Information

IBM has published remediation guidance for CVE-2026-13463 on its support portal. Administrators should consult the IBM Support Page for the applicable fix pack, interim fix, or configuration change for IBM Cloud Pak System 2.3.5.0 and validate deployment in a non-production environment before rollout.

Workarounds

Tighten log directory permissions so only privileged administrators can read Cloud Pak System log files.
Reduce logging verbosity where possible to prevent credential material from being written by verbose or debug handlers.
Deploy a log-scrubbing pipeline that redacts credential patterns before logs are stored or forwarded to downstream systems.

bash

# Restrict access to IBM Cloud Pak System log directories
chown -R root:root /var/log/cloudpak
chmod -R 700 /var/log/cloudpak
find /var/log/cloudpak -type f -exec chmod 600 {} \;