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CVE-2026-55240

9.1 · CRITICAL

Tianji is an open source analytics, uptime monitoring, and server status platform.

Published Oct 15, 2026CWE-1336EPSS 0.75%

Overview

CVE-2026-55240 is a critical-severity vulnerability. It was published on October 15, 2026 and has a CVSS 3.1 base score of 9.1 (CRITICAL).

This vulnerability has a CVSS 3.1 base score of 9.1, rated CRITICAL. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

GitHubgithub.com/msgbyte/tianji/commit/132ff67907df897d222829ea8ad1a018ff74df48GitHubgithub.com/msgbyte/tianji/releases/tag/v1.31.29GitHubgithub.com/msgbyte/tianji/security/advisories/GHSA-5grg-j3cr-3hpmGitHubgithub.com/msgbyte/tianji/security/advisories/GHSA-5grg-j3cr-3hpm

How CyberStrike helps

Frequently asked questions

What is CVE-2026-55240?

CVE-2026-55240 is a critical-severity vulnerability. It was published on October 15, 2026 and has a CVSS 3.1 base score of 9.1 (CRITICAL).

How severe is CVE-2026-55240?

This vulnerability has a CVSS 3.1 base score of 9.1, rated CRITICAL. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2026-55240?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-55240?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-55240 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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