---
id: CVE-2026-55839
title: 'Kestra is an open-source, event-driven orchestration platform'
summary: >-
  Kestra is an open-source, event-driven orchestration platform. Prior to
  1.3.24, Kestra's custom Markdown parser in
  ui/src/utils/markdown_plugins/link.ts allows a user with permission to create
  or update a Flow description to inject JavaS…
severity: high
cvss: 8.7
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N'
cwe:
  - CWE-79
vendor: kestra
product: 'io.kestra:kestra'
affected:
  - 'io.kestra:kestra < 1.3.24'
patched:
  - 'io.kestra:kestra 1.3.24'
published: '2026-08-18'
updated: '2026-09-16'
sourceUpdated: '2026-09-16T13:42:45.297'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-55839'
references:
  - url: >-
      https://github.com/kestra-io/kestra/commit/6c8e6d099ed172cbb6b003b7fb30b7bb1f8f710e
    label: security-advisories@github.com
  - url: 'https://github.com/kestra-io/kestra/pull/16835'
    label: security-advisories@github.com
  - url: 'https://github.com/kestra-io/kestra/releases/tag/v1.3.24'
    label: security-advisories@github.com
  - url: >-
      https://github.com/kestra-io/kestra/security/advisories/GHSA-34pm-923j-7wf8
    label: security-advisories@github.com
  - url: 'https://github.com/advisories/GHSA-34pm-923j-7wf8'
tags:
  - nvd
  - ghsa
  - maven
epss: 0.0043
epssPercentile: 0.34605
aliases:
  - GHSA-34pm-923j-7wf8
ecosystem: maven
ingestedAt: '2026-08-18T17:20:36.730Z'
---

## Overview

Kestra is an open-source, event-driven orchestration platform. Prior to 1.3.24, Kestra's custom Markdown parser in ui/src/utils/markdown_plugins/link.ts allows a user with permission to create or update a Flow description to inject JavaScript event-handler attributes through the custom [[link]] syntax, causing stored cross-site scripting when another user opens the description or information panel in the Flow list. This issue is fixed in version 1.3.24.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.

## Package advisory (CVE-2026-55839)

Affected packages:

- `io.kestra:kestra < 1.3.24`

Patched in:

- `io.kestra:kestra 1.3.24`

Source: https://github.com/advisories/GHSA-34pm-923j-7wf8