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.
CVE-2026-34164
This medium-severity CVE scores 4.9 under NVD CVSS v3. EPSS exploit probability: 0.0%, top 97% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).
- Lower severity and no public exploit yet
No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.
- CVSS v3
- 4.9
- EG Score
- 4.9(medium)
- EPSS
- 28.8%
- KEV
- Not listed
Published
April 16, 2026
Last Modified
April 29, 2026
References (5)
- security-advisories@githubhttps://github.com/generiekzaakafhandelcomponent/gzac-issues/issues/653
- security-advisories@githubhttps://github.com/valtimo-platform/valtimo/commit/f16a1940ba7b34627c0b966f98ca78655ace9335
- security-advisories@githubhttps://github.com/valtimo-platform/valtimo/pull/497
- security-advisories@githubhttps://github.com/valtimo-platform/valtimo/releases/tag/13.22.0
- security-advisories@githubhttps://github.com/valtimo-platform/valtimo/security/advisories/GHSA-hfrg-mcvw-8mch
Affected Packages
(1 across 1 ecosystem)
Maven(1)
| Package | Vulnerable range | Fixed in | Dependents |
|---|---|---|---|
| com.ritense.valtimo:inbox | 13.0.0.RELEASE ... 13.9.1.RELEASE (32 versions) | 13.22.0.RELEASE | — |
Weakness Classification(1)
MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.
Data Freshness Timeline
(refreshed 8× in last 7d / 39× in last 30d)
Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.
- 2026-07-12 05:46 UTCEPSS rescore
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- 2026-05-23 00:08 UTCEG score recompute
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Related CVEs(same CWE)
Same CWE
10 shownCWE-532
- CVE-2016-0898EG 10.0CRITICAL
- CVE-2018-17922EG 9.8CRITICAL
- CVE-2018-1264NVD 9.1EG 9.8CRITICAL
- CVE-2018-16049EG 9.8CRITICAL
- CVE-2018-11717EG 9.8EPSS 94%CRITICAL
- CVE-2018-11716EG 9.8EPSS 96%CRITICAL
- CVE-2018-0042EG 9.8CRITICAL
- CVE-2018-1072NVD 5.0EG 9.8MEDIUM
- CVE-2018-1117NVD 5.0EG 9.8MEDIUM
- CVE-2018-11320EG 9.8CRITICAL
Frequently asked(5)
What is CVE-2026-34164?
When was CVE-2026-34164 disclosed?
Is CVE-2026-34164 actively exploited?
What is the CVSS score of CVE-2026-34164?
How do I remediate CVE-2026-34164?
Dependency Blast Radius
See which npm, PyPI, Go, and Maven packages are affected by CVE-2026-34164
Is Your Infrastructure Affected by CVE-2026-34164?
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