valtimo up to 13.21.0 Admin UI Logging log file

Summaryinfo

A vulnerability was found in valtimo up to 13.21.0. It has been classified as problematic. Affected by this issue is some unknown functionality of the component Admin UI Logging Module. This manipulation causes log file. This vulnerability is registered as CVE-2026-34164. Remote exploitation of the attack is possible. No exploit is available. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability classified as problematic was found in valtimo up to 13.21.0. Affected by this vulnerability is an unknown code block of the component Admin UI Logging Module. The manipulation with an unknown input leads to a log file vulnerability. The CWE definition for the vulnerability is CWE-532. Information written to log files can be of a sensitive nature and give valuable guidance to an attacker or expose sensitive user information. As an impact it is known to affect confidentiality. The summary by CVE is:

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.

The advisory is shared at github.com. This vulnerability is known as CVE-2026-34164 since 03/25/2026. The exploitation appears to be easy. The attack can be launched remotely. The exploitation requires an enhanced level of successful authentication. Neither technical details nor an exploit are publicly available. MITRE ATT&CK project uses the attack technique T1592 for this issue.

Upgrading to version 13.22.0 eliminates this vulnerability. The upgrade is hosted for download at github.com. Applying the patch f16a1940ba7b34627c0b966f98ca78655ace9335 is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Name

• valtimo

Version

• 13.0
• 13.1
• 13.2
• 13.3
• 13.4
• 13.5
• 13.6
• 13.7
• 13.8
• 13.9
• 13.10
• 13.11
• 13.12
• 13.13
• 13.14
• 13.15
• 13.16
• 13.17
• 13.18
• 13.19
• 13.20
• 13.21.0

License

• open-source

CPE 2.3info

• 🔒
• 🔒
• 🔒

CPE 2.2info

• 🔒
• 🔒
• 🔒

CVSSv4info

CVSSv3info

CVSSv2info

Exploitinginfo

Threat Intelligenceinfo

Countermeasuresinfo

Timelineinfo

Sourcesinfo

Entryinfo

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Discussion