# 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.

- **Severity:** Medium 4.9 (`CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** An administrator
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 16 Apr 2026
- **Updated:** 18 Apr 2026
- **Also known as:** GHSA-hfrg-mcvw-8mch

## 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 (Insertion of Sensitive Information into Log File)

## Which versions are affected by CVE-2026-34164?

2 open source packages ship an affected version, including com.ritense.valtimo:inbox.


| Package | Ecosystem | 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.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-34164 and fix it if it is affected.

What it is: 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.
Exploitation: There is no known exploitation of CVE-2026-34164 in the wild and no public exploit code.

Affected packages and fixed versions:
- com.ritense.valtimo:inbox (Maven): affected from 13.0.0.RELEASE; fixed in 13.22.0.RELEASE
- com.ritense.valtimo:inbox (Maven): affected from 13.0.0.RELEASE; fixed in 13.22.0.RELEASE

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-34164/ (Markdown: https://insights.sbomify.com/CVE-2026-34164/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-34164
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-34164
- OSV: https://osv.dev/vulnerability/CVE-2026-34164

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-34164/
Summaries are generated and may contain mistakes; the official description above is the record.