Is this vulnerability remotely exploitable over the network?

Yes, if an attacker can control Markdown content that is rendered by the Kestra execution-file preview and a victim user accesses the Kestra web UI to view that content, the malicious JavaScript can execute in the victim's browser.

What level of access does an attacker need to exploit this?

The attacker needs the ability to create, upload, or otherwise influence `.md` files or Markdown content processed by the execution-file preview. The exact access level depends on how Kestra is deployed and how file uploads or integrations are configured.

What is the safest general fix pattern for developers?

Disable raw HTML in Markdown for untrusted content, remove or minimise usage of `v-html` for user-controlled data, and insert a robust sanitisation step that strips scripts and dangerous attributes from all HTML derived from user input before rendering.

Severity:

HIGH RISK

(7.3)

Stored Cross-Site Scripting (CWE-79) in Kestra Execution-File Markdown Preview

CVE-2026-29082

Published:

Mar 6, 2026

Status:

Received

Summary

Affected Context

Exploit Preconditions

Why This Happens

Potential Impact

General Mitigation Guidance

How Teams Detect Issues Like This

Frequently Asked Questions

Source

NDV

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Vulnerability Type

Category:

Cross-Site Scripting (XSS)

CWE:

CWE-79

Impact:

Stored Cross-Site Scripting leading to arbitrary JavaScript execution in users' browsers

Severity:

HIGH RISK

(7.3)

CVSS Version:

3.1

Vulnerability Type

Category:

Cross-Site Scripting (XSS)

CWE:

CWE-79

Impact:

Stored Cross-Site Scripting leading to arbitrary JavaScript execution in users' browsers

Severity:

HIGH RISK

(7.3)

CVSS Version:

3.1

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Stored Cross-Site Scripting (CWE-79) in Kestra Execution-File Markdown Preview

Summary

Affected Context

Exploit Preconditions

Why This Happens

Potential Impact

General Mitigation Guidance

How Teams Detect Issues Like This

Frequently Asked Questions

Source

Recent Vulnerabilities

CRITICAL RISK

CRITICAL

(9.9)

Command Injection in MCP Stdio Configuration Validation (CWE-78) in WeKnora

CRITICAL RISK

CRITICAL

(9.9)

SQL Injection via PostgreSQL Array/Row Expressions (CWE-89) in WeKnora Query Engine

Vulnerability Type

Vulnerability Type

Vulnerability Type

Catch This CVE While Code Is Being Written

Ship clean & secure code faster

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