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Vulnerabilities CVE-2026-55839

CVE-2026-55839

High
Open
TLP:CLEAR

Kestra: Stored XSS via custom Markdown [[link]] attribute injection

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Description

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.

Details

CVSS Score
8.7
CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N
Confidence
90%
Published
Aug 18, 2026
Last Modified
Aug 18, 2026
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