CVE-2026-55839 Kestra: Stored XSS via custom Markdown [[link]] attribute injection

Kestra is an open-source, event-driven orchestration platform. Prior to 1.3.24, Kestra's custom Markdown parser in ui/src/utils/markdownplugins/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...

CVE-2026-55839

Kestra , an open-source event-driven orchestration platform, is vulnerable to stored cross-site scripting (XSS) in versions prior to 1.3.24 . The root cause is in the custom Markdown parser (ui/src/utils/markdown_plugins/link.ts), which renders parsed attributes from the [[link]] syntax directly ...