CVE-2026-55839
High
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.
SeverityHigh
CVSS8.7
Exploit probability—
ProductIo.kestra:kestra
PublishedAug 18, 2026
First seenAug 18, 2026
Weakness typeCWE-79Cross-site scripting (XSS)
How to fix
Update
- io.kestra:kestra1.3.24 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| io.kestra:kestraMaven | v < 1.3.24 | 1.3.24 |
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