CVE-2026-34164 is a medium-severity (CVSS 4.9) CWE-532 vulnerability in com.ritense.valtimo:inbox. A fix is available for com.ritense.valtimo:inbox — see the affected versions and patch details below.
Valtimo: Sensitive data exposure through inbox message logging in InboxHandlingService
Exploitation Status
No confirmed exploitation observed yet
- CISA’s own triage has not observed active exploitation or public proof-of-concept code for this CVE as of its last assessment.
Exploitation and automatability from CISA’s SSVC triage for CVE-2026-34164.
EPSS Exploitation Probability
EPSS (Exploit Prediction Scoring System) is a daily probability model maintained by FIRST.org. It estimates the likelihood a CVE will be exploited in production environments within the next 30 days, derived from real-world threat intelligence signals.
How urgent is this, really
CVE-2026-34164 plotted by exploitation likelihood (EPSS) against impact (CVSS). The shaded corner — EPSS 50%+ and CVSS 7.0+ — is where this CVE doesn't sit, though severity or exploitability alone can still warrant action.
Where this sits among everything scored
Of 378,156 CVEs with a current EPSS score, this one falls in the < 10% band (highlighted). Real counts from FIRST.org, not a sample — log-scaled since the landscape is heavily right-skewed.
Real-World Exposure
com.ritense.valtimo:inboxReal-time download stats are indexed for npm and PyPI packages. This vulnerability affects Maven packages — download data is not available via public APIs for these ecosystems.
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.inboxto WARN or higher in your application configuration
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| ☕Maven | com.ritense.valtimo:inbox | ≥ 13.0.0.RELEASE&&< 13.22.0.RELEASE | 13.22.0.RELEASEcom.ritense.valtimo:inbox:13.22.0.RELEASE |
Detection & mitigation playbook
Open-source dependencyDetect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for com.ritense.valtimo:inbox, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update com.ritense.valtimo:inbox to 13.22.0.RELEASE or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2026-34164 is resolved across your whole dependency graph.
Workarounds
If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.
How O3 protects you
O3 Security's impact-aware SCA analyses which vulnerable code paths your application actually calls, so a match like CVE-2026-34164 can be triaged on real exposure rather than presence alone.
Tailored to CVE-2026-34164. Runtime protection reduces exposure until a permanent patch is applied and verified — it complements patching, it doesn't replace it.
Frequently Asked Questions
Is CVE-2026-34164 in your dependencies?
O3 Security finds CVE-2026-34164 across Maven dependencies, including transitive ones, and its impact-aware SCA ranks findings by whether your code actually calls the vulnerable path.