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Sensitive data exposure through inbox message logging in InboxHandlingService

Moderate
theo-ritense published GHSA-hfrg-mcvw-8mch Apr 16, 2026

Package

maven com.ritense.valtimo:inbox (Maven)

Affected versions

>= 13.0.0, < 13.22.0

Patched versions

13.22.0

Description

Summary

The InboxHandlingService logs the full content of every incoming inbox message at INFO level (logger.info("Received message: {}", message)). Inbox messages are wrappers around outbox message data, which can contain highly sensitive information such as personal data (PII), citizen identifiers (BSN), and case details.

Impact

This data is exposed to:

  • Anyone with access to application logs (stdout/log files)
  • Any Valtimo user with the admin role, through the logging module in the Admin UI

Affected Code

com.ritense.inbox.InboxHandlingService#handle in the inbox module.

Resolution

Fixed in 13.22.0 via commit f16a1940ba (PR #497, tracking issue gzac-issues#653). The log statement was downgraded from INFO to DEBUG and the message payload was removed from the log output.

Mitigation

For versions before 13.22.0, consider:

  • Restricting access to application logs
  • Adjusting the log level for com.ritense.inbox to WARN or higher in your application configuration

Severity

Moderate

CVSS overall score

This score calculates overall vulnerability severity from 0 to 10 and is based on the Common Vulnerability Scoring System (CVSS).
/ 10

CVSS v3 base metrics

Attack vector
Network
Attack complexity
Low
Privileges required
High
User interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
None
Availability
None

CVSS v3 base metrics

Attack vector: More severe the more the remote (logically and physically) an attacker can be in order to exploit the vulnerability.
Attack complexity: More severe for the least complex attacks.
Privileges required: More severe if no privileges are required.
User interaction: More severe when no user interaction is required.
Scope: More severe when a scope change occurs, e.g. one vulnerable component impacts resources in components beyond its security scope.
Confidentiality: More severe when loss of data confidentiality is highest, measuring the level of data access available to an unauthorized user.
Integrity: More severe when loss of data integrity is the highest, measuring the consequence of data modification possible by an unauthorized user.
Availability: More severe when the loss of impacted component availability is highest.
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N

CVE ID

CVE-2026-34164

Weaknesses

Insertion of Sensitive Information into Log File

The product writes sensitive information to a log file. Learn more on MITRE.
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