All vulnerabilities
CVE-2026-55240GHSA-5grg-j3cr-3hpm

Tianji: Remote Code Execution via lodash template evaluate pattern in survey feed templates

msgbyte tianji
Open in ThreatlineRecord JSON
CVSS
9.1Critical
ExploitationNo known exploitationNot in CISA KEV, which does not prove it is unexploitedCISA KEV
Exploit odds (EPSS)0.58%Chance of exploitation activity in the next 30 days, higher than 46% of CVEs. Scored 23 Oct 2026FIRST EPSS
Fixed in1.31.29Fixed versionGitHub
Published15 Oct 2026Updated 15 Oct 2026CVE List

What fixes it

  • 1.31.29tianji, npmGitHubnpm install tianji@1.31.29

A fixed version on one release line is not the upgrade target for every line. Check your exact version and any vendor backports.

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.

Text from CVE List

Affected versions 2

  • tianjiaffected: < 1.31.29CVE List
  • tianji, npm<= 1.31.28GitHub

References 3