CVE-2026-55240

critical · 9.1

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.

9.1

CVSS

0.6%

EPSS (exploit prob.)

47th

EPSS percentile

2026-10-15

Published

CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H

Weaknesses

CWE-1336

References

https://github.com/msgbyte/tianji/commit/132ff67907df897d222829ea8ad1a018ff74df48
https://github.com/msgbyte/tianji/releases/tag/v1.31.29
https://github.com/msgbyte/tianji/security/advisories/GHSA-5grg-j3cr-3hpm

Query this programmatically:

curl https://evil-db.io/api/v1/cve/CVE-2026-55240