---
cve: "CVE-2026-55839"
severity: "HIGH"
cvss: 8.7
epss: "30%"
vendor: "kestra-io"
kev: false
exploited: false
published: "2026-08-18 16:17:53"
tags: [cve, security, high]
source: tsecurity.de CVE-Dossier
exported: "2026-09-14T16:49:59+02:00"
---

# CVE-2026-55839

> 8.7 HIGH · 🧪 PoC

## Beschreibung

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.

## CVSS-Vektor

```
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N
```

| Metrik | Wert | Bewertung |
|---|---|---|
| AV Angriffsvektor | Netzwerk | bad |
| AC Komplexität | Gering | bad |
| PR Privilegien | Gering | warn |
| UI Interaktion | Erforderlich | good |
| S Scope | Verändert | bad |
| C Vertraulichkeit | Hoch | bad |
| I Integrität | Hoch | bad |
| A Verfügbarkeit | Keine | good |

## Patch verfügbar (OSV)

- 6c8e6d099ed172cbb6b003b7fb30b7bb1f8f710e (Commit)
- 51fcc9e4e7b69a706e10f77aaf1fdf56b7eb6630 (Commit)

## Referenzen

- <https://github.com/kestra-io/kestra/security/advisories/GHSA-34pm-923j-7wf8>
- <https://github.com/kestra-io/kestra/pull/16835>
- <https://github.com/kestra-io/kestra/commit/6c8e6d099ed172cbb6b003b7fb30b7bb1f8f710e>
- <https://github.com/kestra-io/kestra/releases/tag/v1.3.24>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-55839) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_