CVE-2026-55240
Tenable Plugin
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Threat Intelligence Pending
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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.
Quick Facts
| CVE ID | CVE-2026-55240 |
| CVSS Score | 9.1 |
| Vector | CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H |
| Published | 2026-10-15 |
| Exploited | No |
| CISA KEV | No |
| PoC | Not public |