CVE-2026-19649: IBM App Connect Enterprise Info Disclosure

CVE-2026-19649 Overview

CVE-2026-19649 is an information disclosure vulnerability in IBM App Connect Enterprise and IBM Integration Bus for z/OS. The flaw stems from improper logging of database credentials, which allows a local attacker with low privileges to read sensitive authentication material from log files. The vulnerability is classified under [CWE-532]: Insertion of Sensitive Information into Log File.

Affected releases include IBM App Connect Enterprise 13.0.1.0 through 13.0.8.1, 12.0.1.0 through 12.0.12.28, and IBM Integration Bus for z/OS 10.1.0.0 through 10.1.0.7.

Critical Impact
A local attacker with access to log files can harvest plaintext database credentials, enabling lateral movement into backend databases integrated with App Connect Enterprise flows.

Affected Products

IBM App Connect Enterprise 13.0.1.0 through 13.0.8.1
IBM App Connect Enterprise 12.0.1.0 through 12.0.12.28
IBM Integration Bus for z/OS 10.1.0.0 through 10.1.0.7

Discovery Timeline

2026-09-04 - CVE-2026-19649 published to the National Vulnerability Database
2026-09-09 - Last updated in NVD database

Technical Details for CVE-2026-19649

Vulnerability Analysis

IBM App Connect Enterprise integrates enterprise applications by orchestrating message flows that connect to databases, queues, and web services. During normal operation, the runtime records diagnostic information about connections, transactions, and integration servers to log files. The vulnerable versions write database credentials into these logs without redaction or masking.

Any user with read access to the log directory on the host can retrieve credentials for databases referenced by deployed integration flows. The attack does not require network access, elevated privileges, or user interaction. Exposure scales with the number of database endpoints configured across integration nodes and servers.

Root Cause

The root cause is improper handling of sensitive data during logging routines within the App Connect Enterprise and Integration Bus runtimes. Credential values passed through connection configuration objects are serialized into log entries in cleartext rather than being filtered, hashed, or replaced with a placeholder before write operations.

Attack Vector

The attacker must have local access to the system hosting the affected product. Common scenarios include operators, application support staff, or compromised low-privilege service accounts that hold read access to /var/log, integration node work directories, or z/OS SYSLOG datasets. Once credentials are extracted, the attacker can authenticate directly to the backend database from any location that database accepts connections from.

No verified public exploit code is available for this issue. Refer to the IBM Support Article for vendor-specific technical details.

Detection Methods for CVE-2026-19649

Indicators of Compromise

Log files under integration node work directories containing plaintext strings resembling database connection URLs, usernames, or passwords.
Unexpected read access to App Connect Enterprise log directories by non-administrative user accounts.
Successful database authentications from hosts or accounts that do not normally originate integration traffic.

Detection Strategies

Grep log files for patterns such as password=, pwd=, jdbc:, or known service-account usernames to confirm exposure before remediation.
Audit file system access control lists on integration node and server log directories to identify accounts with unnecessary read permissions.
Correlate database authentication events with expected source IPs and process identities to surface anomalous logins.

Monitoring Recommendations

Enable file integrity and access monitoring on App Connect Enterprise log directories and z/OS SYSLOG datasets.
Forward integration server logs and database audit logs to a centralized analytics platform for cross-source correlation.
Alert on any manual copy, archive, or download of ACE log files by interactive user sessions.

How to Mitigate CVE-2026-19649

Immediate Actions Required

Apply the IBM fix pack referenced in the IBM Support Article for the affected version stream.
Rotate all database credentials that may have been written to logs on affected integration nodes prior to patching.
Restrict read access to integration node log directories to administrators and the integration server runtime account only.

Patch Information

IBM has issued fixes for the affected versions. Administrators should upgrade beyond IBM App Connect Enterprise 13.0.8.1, 12.0.12.28, and IBM Integration Bus for z/OS 10.1.0.7 per the vendor advisory. Verify installed fix pack level after upgrade using mqsiservice -v on affected nodes.

Workarounds

Purge or securely archive existing log files that may contain plaintext credentials before restricting further access.
Tighten file system permissions on log paths so only the runtime user and privileged administrators can read them.
Store database credentials in a secrets manager and reference them by alias in integration flows to minimize exposure surface.

bash

# Restrict log directory access on Linux integration nodes
chown -R aceuser:acegroup /var/mqsi/components/<node>/log
chmod -R 700 /var/mqsi/components/<node>/log

# Rotate exposed credentials for a referenced database alias
mqsisetdbparms <node> -n jdbc::<aliasName> -u <newUser> -p <newPassword>