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

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-55240
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-10-15 19:17:40 UTC
Updated2026-10-16 20:04:29 UTC
DescriptionTianji 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.

Risk And Classification

Primary CVSS: v3.1 9.1 CRITICAL from [email protected]

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

EPSS: 0.005760000 probability, percentile 0.463270000 (date 2026-10-16)

Problem Types: CWE-1336 | CWE-1336 CWE-1336: Improper Neutralization of Special Elements Used in a Template Engine

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary9.1CRITICALCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
3.1CNADECLARED9.1CRITICALCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
High
User Interaction
None
Scope
Changed
Confidentiality
High
Integrity
High
Availability
High

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Msgbyte Tianji affected < 1.31.29 Not specified

References

ReferenceSourceLinkTags
github.com/msgbyte/tianji/commit/132ff67907df897d222829ea8ad1a018ff74df48 [email protected] github.com
github.com/msgbyte/tianji/security/advisories/GHSA-5grg-j3cr-3hpm [email protected] github.com
github.com/msgbyte/tianji/releases/tag/v1.31.29 [email protected] github.com
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