CVE-2026-55240: Tianji is an open source analytics, uptime monitoring, and server status platform. Prior to 1.31.29, formatString() in s…
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.
- Published by source
- 2026-10-15
- First seen by Reality Radar
- 2026-10-28
- Last verified
- 2026-10-28
What the official notice says
Risk: critical severity (CVSS 9.1)
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Sources
- NIST National Vulnerability Database Tier A · official published 2026-10-15
Evidence ledger
Every piece of evidence we store is appended to a public hash chain, so later edits are detectable. Anyone can re-verify it.
| Entry | Kind | Observed | Evidence hash | Entry hash |
|---|---|---|---|---|
| #2695 | new | 2026-10-28 | 52578a1baa6a…5467c7 | e6567e033a72…28d492 |
Chain head: #2800 60b0da2762c7…c27b07