CVE-2026-56547: HCL Traveler Information Disclosure Vulnerability

CVE-2026-56547 Overview

CVE-2026-56547 is an input validation weakness in HCL Traveler's Apple profile generation feature. The profile generator for the Apple built-in Mail, Calendar, and Contacts client requires the Logon Name and Mail Address to be embedded in the generated configuration profile. HCL Traveler reflects those values back from the user-supplied form without verifying them against the authenticated user's Domino directory entry. The generated profile is not usable without additional attacker-controlled infrastructure, and the resulting attack surface only affects the submitter's own device.

Critical Impact
An authenticated user can craft an Apple configuration profile containing arbitrary Logon Name and Mail Address values that do not match their Domino directory entry, resulting in limited availability impact.

Affected Products

HCL Traveler (Apple profile generation page)
Apple Mail, Calendar, and Contacts client configuration workflow
IBM/HCL Domino directory integration path

Discovery Timeline

2026-08-26 - CVE-2026-56547 published to NVD
2026-08-26 - Last updated in NVD database

Technical Details for CVE-2026-56547

Vulnerability Analysis

HCL Traveler generates Apple configuration profiles so that iOS and macOS devices can synchronize Mail, Calendar, and Contacts with a Domino back end. The Apple profile format embeds the Logon Name and Mail Address at generation time, and these values cannot be changed after the profile is issued. The generation page therefore prompts the authenticated user for both values and reflects them back into the resulting profile.

The server-side handler does not cross-check the submitted values against the authenticated user's Domino directory entry. An authenticated user can therefore embed identifiers that do not correspond to their own account. The resulting profile is incomplete on its own and requires additional infrastructure to be usable, so exploitation is limited to attacking the attacker's own device.

Root Cause

The root cause is improper input validation [CWE-20]. The Apple profile generator trusts client-supplied Logon Name and Mail Address fields and reflects them into the generated profile without validating them against the already-authenticated session's Domino directory record.

Attack Vector

Exploitation requires an authenticated Traveler user and user interaction to load the generated profile on an Apple device. The attack is network-reachable through the Traveler profile generation page. Because the profile still requires attacker-controlled endpoints to function and only impacts the attacker's own device, the practical scope is limited to low availability impact on the submitting user.

No verified exploit code is available. See the HCL Software Knowledge Base Article for vendor technical details.

Detection Methods for CVE-2026-56547

Indicators of Compromise

Apple configuration profiles issued by HCL Traveler whose embedded Logon Name or Mail Address does not match the authenticated user's Domino directory entry.
Traveler profile generation requests where the submitted mail address diverges from the session's authenticated identity.
Enrolled Apple devices attempting Traveler synchronization with identifiers absent from the Domino directory.

Detection Strategies

Correlate Traveler profile generation logs with Domino directory records to flag profiles containing identifiers that do not match the authenticated user.
Compare MailAddress and LogonName values in issued .mobileconfig files against the session principal recorded server-side.
Alert on repeated profile generation attempts from a single account that produce differing identity fields.

Monitoring Recommendations

Enable verbose logging on the Traveler Apple profile generation endpoint and forward events to a centralized SIEM for correlation with Domino authentication logs.
Track Apple device enrollment events against the authoritative Domino directory to identify identifier drift.
Review Traveler administrative logs for anomalous profile generation volume per account.

How to Mitigate CVE-2026-56547

Immediate Actions Required

Apply the fix referenced in the HCL Software Knowledge Base Article once available in your supported Traveler release.
Restrict access to the Apple profile generation page to authenticated users who require Apple device synchronization.
Audit previously issued Apple configuration profiles for identifier mismatches against the Domino directory.

Patch Information

HCL Software has published guidance in knowledge base article KB0132221. Administrators should review the article for supported Traveler versions and remediation steps. Refer to the HCL Software Knowledge Base Article for the authoritative fix information.

Workarounds

Instruct users to generate Apple profiles only through the standard authenticated Traveler workflow and to avoid manually altering Logon Name or Mail Address fields.
Monitor profile issuance and cross-check identifiers against the Domino directory until the vendor patch is applied.
Limit network exposure of the Traveler profile generation endpoint to trusted client networks or VPN users.

bash

# Configuration example
# Review vendor knowledge base KB0132221 for authoritative remediation steps
# https://support.hcl-software.com/csm?id=kb_article&sysparm_article=KB0132221