{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "extracted_events": [
              {
                "introduced": "0"
              },
              {
                "fixed": "1.3.24"
              }
            ],
            "source": [
              "AFFECTED_FIELD",
              "REFERENCES"
            ]
          },
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "6c8e6d099ed172cbb6b003b7fb30b7bb1f8f710e"
            },
            {
              "fixed": "51fcc9e4e7b69a706e10f77aaf1fdf56b7eb6630"
            }
          ],
          "repo": "https://github.com/kestra-io/kestra",
          "type": "GIT"
        }
      ]
    }
  ],
  "aliases": [
    "GHSA-34pm-923j-7wf8"
  ],
  "database_specific": {
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
      "CWE-79"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/55xxx/CVE-2026-55839.json"
  },
  "details": "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.",
  "id": "CVE-2026-55839",
  "modified": "2026-08-20T03:30:21.219051814Z",
  "published": "2026-08-18T15:27:18.261Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/kestra-io/kestra/releases/tag/v1.3.24"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/55xxx/CVE-2026-55839.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/kestra-io/kestra/security/advisories/GHSA-34pm-923j-7wf8"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-55839"
    },
    {
      "type": "FIX",
      "url": "https://github.com/kestra-io/kestra/commit/6c8e6d099ed172cbb6b003b7fb30b7bb1f8f710e"
    },
    {
      "type": "FIX",
      "url": "https://github.com/kestra-io/kestra/pull/16835"
    }
  ],
  "schema_version": "1.9.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Kestra: Stored XSS via custom Markdown [[link]] attribute injection"
}