CVE-2026-55240Public exploitNetwork attack vectorHinoki check available

Admin-level code execution via evaluated survey templates

Published Oct 15, 2026 · Updated Oct 15, 2026

Template injection in MsgByte Tianji before 1.31.29 allows remote authenticated users to execute code via survey feed templates. The formatString() utility in src/server/utils/template.ts compiles survey and monitor templates with lodash template() while leaving its default JavaScript evaluation pattern enabled. Storing a malicious template requires workspace administrator access; public survey submission triggers its execution in the Node.js process, enabling command execution, secret disclosure, and data modification.

CVSS severity9.1
Critical
EPSS probability0.58%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Get started

Summary

What happened

Template injection in MsgByte Tianji before 1.31.29 allows remote authenticated users to execute code via survey feed templates. The formatString() utility in src/server/utils/template.ts compiles survey and monitor templates with lodash template() while leaving its default JavaScript evaluation pattern enabled. Storing a malicious template requires workspace administrator access; public survey submission triggers its execution in the Node.js process, enabling command execution, secret disclosure, and data modification.

The record

CVE
CVE-2026-55240
Published
Oct 15, 2026
Updated
Oct 15, 2026
Vendor
MsgByte
Product
Tianji
Classifications
CWE-1336, T1059.007
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. Oct 15, 2026CVE publishedPublication date reported by the CVE source.
  2. Oct 15, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 1.31.29

What conditions does exploitation require?

Attack vectornetwork
Required privilegesadmin

What is affected?

MsgByte · Tianjiversion=< 1.31.29

Published CVSS scores

9.1GitHub_MCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Activity data is delayed. The latest report is Sep 28, 2026.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesadmin
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-1336Improper Neutralization of Special Elements Used in a Template Engine
T1059.007JavaScript

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Get started to see how Hinoki identifies affected software and validates exploitability in your environment.

Get started