CVE-2026-55839

{
  "id": "CVE-2026-55839",
  "sourceIdentifier": "[email protected]",
  "published": "2026-08-18T16:17:53.710",
  "lastModified": "2026-10-22T22:10:00.250",
  "vulnStatus": "Deferred",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "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."
    },
    {
      "lang": "es",
      "value": "Kestra es una plataforma de orquestación de código abierto y basada en eventos. Antes de la versión 1.3.24, el analizador de Markdown personalizado de Kestra en ui/src/utils/markdown_plugins/link.ts permite a un usuario con permiso para crear o actualizar la descripción de un Flow inyectar atributos de gestor de eventos de JavaScript a través de la sintaxis personalizada [[link]], causando cross-site scripting almacenado cuando otro usuario abre la descripción o el panel de información en la lista de Flows. Este problema se ha solucionado en la versión 1.3.24."
    }
  ],
  "affected": [
    {
      "source": "[email protected]",
      "affectedData": [
        {
          "vendor": "kestra-io",
          "product": "kestra",
          "versions": [
            {
              "version": "< 1.3.24",
              "status": "affected"
            }
          ]
        }
      ]
    }
  ],
  "metrics": {
    "cvssMetricV31": [
      {
        "source": "[email protected]",
        "type": "Secondary",
        "cvssData": {
          "version": "3.1",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N",
          "baseScore": 8.7,
          "baseSeverity": "HIGH",
          "attackVector": "NETWORK",
          "attackComplexity": "LOW",
          "privilegesRequired": "LOW",
          "userInteraction": "REQUIRED",
          "scope": "CHANGED",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "availabilityImpact": "NONE"
        },
        "exploitabilityScore": 2.3,
        "impactScore": 5.8
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "timestamp": "2026-08-18T17:28:28.962947Z",
          "id": "CVE-2026-55839",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "total"
            }
          ],
          "role": "CISA Coordinator",
          "version": "2.0.3"
        }
      }
    ]
  },
  "weaknesses": [
    {
      "source": "[email protected]",
      "type": "Secondary",
      "description": [
        {
          "lang": "en",
          "value": "CWE-79"
        }
      ]
    }
  ],
  "references": [
    {
      "url": "https://github.com/kestra-io/kestra/commit/6c8e6d099ed172cbb6b003b7fb30b7bb1f8f710e",
      "source": "[email protected]"
    },
    {
      "url": "https://github.com/kestra-io/kestra/pull/16835",
      "source": "[email protected]"
    },
    {
      "url": "https://github.com/kestra-io/kestra/releases/tag/v1.3.24",
      "source": "[email protected]"
    },
    {
      "url": "https://github.com/kestra-io/kestra/security/advisories/GHSA-34pm-923j-7wf8",
      "source": "[email protected]"
    }
  ]
}