Tianji is an open source analytics, uptime monitoring, and server status platform. Prior to 1.31.29, formatString() in src/server/utils/template.ts passes survey feedTemplate and monitor notification templates to lodash template(), while the default evaluate pattern remains enabled. A workspace administrator can store an evaluate block using the <% code %> form, and the public survey.submit endpoint renders a survey template when an unauthenticated user submits a response. The compiled template executes server-side JavaScript in the Tianji Node.js process, allowing command execution, secret disclosure, data modification, or service disruption. This issue is fixed in version 1.31.29.
History

Wed, 28 Oct 2026 22:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'poc', 'Technical Impact': 'total'}, 'version': '2.0.3'}


Mon, 19 Oct 2026 13:15:00 +0000

Type Values Removed Values Added
First Time appeared Msgbyte
Msgbyte tianji
Vendors & Products Msgbyte
Msgbyte tianji

Thu, 15 Oct 2026 18:30:00 +0000

Type Values Removed Values Added
Description Tianji is an open source analytics, uptime monitoring, and server status platform. Prior to 1.31.29, formatString() in src/server/utils/template.ts passes survey feedTemplate and monitor notification templates to lodash template(), while the default evaluate pattern remains enabled. A workspace administrator can store an evaluate block using the <% code %> form, and the public survey.submit endpoint renders a survey template when an unauthenticated user submits a response. The compiled template executes server-side JavaScript in the Tianji Node.js process, allowing command execution, secret disclosure, data modification, or service disruption. This issue is fixed in version 1.31.29.
Title Tianji: Remote Code Execution via lodash template evaluate pattern in survey feed templates
Weaknesses CWE-1336
References
Metrics cvssV3_1

{'score': 9.1, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H'}


cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published: 2026-10-15T18:15:12.957Z

Updated: 2026-10-28T20:04:59.360Z

Reserved: 2026-06-16T16:44:00.624Z

Link: CVE-2026-55240

cve-icon Vulnrichment

Updated: 2026-10-28T20:04:32.282Z

cve-icon NVD

Status : Deferred

Published: 2026-10-15T19:17:40.290

Modified: 2026-10-28T20:18:08.730

Link: CVE-2026-55240

cve-icon Redhat

No data.