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.
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.inboxto WARN or higher in your application configuration
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
CVE-2026-34164 has a CVSS score of 4.9 (Medium). The vector is network-reachable, high privileges required, and no user interaction. A CVSS score reflects the worst-case severity of the vulnerability, not your specific exposure. Whether this affects your application depends on whether the vulnerable code is present and reachable in your environment. A fixed version is available (13.22.0.RELEASE); upgrading removes the vulnerable code path.
Affected versions
Security releases
Kodem intelligence
Severity tells you how bad this could be in the worst case. It does not tell you whether you are exposed. Exploitability and impact are functions of runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A vulnerable package can sit in your dependency tree and never run.
Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter. Kodem's runtime-powered SCA identifies whether this CVE is reachable in your applications.
Remediation advice
Kodem Kai can prioritize this vulnerability in your dependency tree and generate a fix recommendation.
Frequently Asked Questions
- What is CVE-2026-34164? CVE-2026-34164 is a medium-severity security vulnerability in com.ritense.valtimo:inbox (maven), affecting versions >= 13.0.0.RELEASE, < 13.22.0.RELEASE. It is fixed in 13.22.0.RELEASE.
- How severe is CVE-2026-34164? CVE-2026-34164 has a CVSS score of 4.9 (Medium). This score reflects the worst-case severity of the vulnerability, not your specific exposure. Whether it represents real risk in your environment depends on whether the vulnerable code is present and reachable.
- Which versions of com.ritense.valtimo:inbox are affected by CVE-2026-34164? com.ritense.valtimo:inbox (maven) versions >= 13.0.0.RELEASE, < 13.22.0.RELEASE is affected.
- Is there a fix for CVE-2026-34164? Yes. CVE-2026-34164 is fixed in 13.22.0.RELEASE. Upgrade to this version or later.
- Is CVE-2026-34164 exploitable, and should I be worried? Whether CVE-2026-34164 is exploitable in your environment depends on whether the vulnerable code is present and reachable. A CVSS score is a worst-case rating; it does not account for your specific deployment, configuration, or usage patterns. Kodem, an Intelligent Application Security platform, uses runtime intelligence to show which vulnerabilities actually execute in production, so you can focus on the ones that represent real risk. Get a demo
- What actually determines whether CVE-2026-34164 is exploitable, and how bad it is? Exploitability and impact are not fixed properties of a CVE. They depend on runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A high CVSS score on a dependency that never runs is not the same as real risk. Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter.
- How do I fix CVE-2026-34164? Upgrade
com.ritense.valtimo:inboxto 13.22.0.RELEASE or later.