Vulnerability details

CVE-2026-55240

msgbyte tianji

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

CVSS 3.1

9.1Critical

Official 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.

CVSS scores

Score	Version	Source	Vector
9.1Critical	3.1	CVEProject cvelistV5 (CNA) (GitHub_M)	`CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H`

Affected products

Vendor	Product	Versions	Source
msgbyte	tianji	< 1.31.29	CVEProject cvelistV5 (CNA)

References and advisories

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

Kolun on Telegram @kolunsec Exploited CVEs, key news and a daily digest Alerts for this product's next CVEsFollow the product to get new vulnerabilities on Telegram.

Details

Published: 2026-10-15
Last updated: 2026-10-28
State: Published
Assigner (CNA): GitHub_M
Kolun priority: 28 · Low

Exploit prediction (EPSS)

0.74%

Probability of exploitation in 30 days

55.1%

Percentile (among all CVEs)

SSVC assessment (CISA)

Automatable: No
Exploitation: Proof of concept
Technical impact: Total

Weaknesses (CWE)

CWE-1336
Improper Neutralization of Special Elements Used in a Template Engine