CVE-2026-34164 Valtimo: Sensitive data exposure through inbox message logging in InboxHandlingService
Attackers with log access can view sensitive PII and case details exposed in application logs by the InboxHandlingService.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-34164?
CVE-2026-34164 is a medium-severity vulnerability in valtimo-platform valtimo, published on 16 Apr 2026. An attacker needs administrator access to exploit it, with no action from the victim.
Official description
Valtimo is an open-source business process automation platform. In versions 13.0.0 through 13.21.0, the InboxHandlingService logs the full content of every incoming inbox message at INFO level. Inbox messages can contain highly sensitive information including personal data (PII), citizen identifiers (BSN), and case details. This data is exposed to anyone with access to application logs or any Valtimo user with the admin role through the Admin UI logging module. This issue has been fixed in version 13.22.0. If developers are unable to upgrade immediately, they can restrict access to application logs and adjust the log level for com.ritense.inbox to WARN or higher in their application configuration as a workaround.
Weakness: CWE-532
Which versions are affected by CVE-2026-34164?
2 open source packages ship an affected version, including com.ritense.valtimo:inbox.
| Package | Affected | Fixed in |
|---|---|---|
com.ritense.valtimo:inbox Maven | From 13.0.0.RELEASE | 13.22.0.RELEASE |
com.ritense.valtimo:inbox Maven | From 13.0.0.RELEASE | 13.22.0.RELEASE |
How do I fix CVE-2026-34164?
Upgrade com.ritense.valtimo:inbox to 13.22.0.RELEASE or later.
Is CVE-2026-34164 being exploited?
There is no known exploitation of CVE-2026-34164 in the wild and no public exploit code.
Sources
Also known as GHSA-hfrg-mcvw-8mch.