Critical 9.1Published Oct 15, 2026

CVE-2026-55240Tianji: Remote Code Execution via lodash template evaluate pattern in survey feed templates

Updated under an hour ago (2026-10-19 10:23 UTC)

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It affects msgbyte tianji. Add what you run to find out whether that includes you.

EPSS puts the chance of exploitation in the next 30 days at 0.58%, higher than 46% of scored CVEs.

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Every CVE for msgbyte tianji

Exploited in the last 30 days

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: 9.1 CRITICAL (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
Weakness (CWE): CWE-1336
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): 0.58% (percentile 46)
Assigned by: GitHub_M
NVD analysis: Deferred
Record last updated: Oct 15, 2026
First seen by InfoSec Signals: Oct 15, 2026

Affected products

Affected products

msgbyte tianji msgbyte:tianji (from the name)	before 1.31.29	CNA record

References

https://github.com/msgbyte/tianji/security/advisories/GHSA-5grg-j3cr-3hpmx-refsource-confirm
https://github.com/msgbyte/tianji/commit/132ff67907df897d222829ea8ad1a018ff74df48x-refsource-misc
https://github.com/msgbyte/tianji/releases/tag/v1.31.29x-refsource-misc

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.