{"id":"CVE-2026-55839","title":"Kestra is an open-source, event-driven orchestration platform","summary":"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 JavaS…","severity":"high","cvss":8.7,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N","cwe":["CWE-79"],"vendor":"kestra","product":"io.kestra:kestra","affected":["io.kestra:kestra < 1.3.24"],"patched":["io.kestra:kestra 1.3.24"],"published":"2026-08-18","updated":"2026-09-16","sourceUpdated":"2026-09-16T13:42:45.297","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-55839","references":[{"url":"https://github.com/kestra-io/kestra/commit/6c8e6d099ed172cbb6b003b7fb30b7bb1f8f710e","label":"security-advisories@github.com"},{"url":"https://github.com/kestra-io/kestra/pull/16835","label":"security-advisories@github.com"},{"url":"https://github.com/kestra-io/kestra/releases/tag/v1.3.24","label":"security-advisories@github.com"},{"url":"https://github.com/kestra-io/kestra/security/advisories/GHSA-34pm-923j-7wf8","label":"security-advisories@github.com"},{"url":"https://github.com/advisories/GHSA-34pm-923j-7wf8"}],"tags":["nvd","ghsa","maven"],"epss":0.00302,"epssPercentile":0.23141,"aliases":["GHSA-34pm-923j-7wf8"],"ecosystem":"maven","ingestedAt":"2026-08-18T17:20:36.730Z","slug":"CVE-2026-55839","body":"## Overview\n\nKestra 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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n## Package advisory (CVE-2026-55839)\n\nAffected packages:\n\n- `io.kestra:kestra < 1.3.24`\n\nPatched in:\n\n- `io.kestra:kestra 1.3.24`\n\nSource: https://github.com/advisories/GHSA-34pm-923j-7wf8","depth":"twilight","depthScore":48,"depthScoreParts":{"impact":47.8,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}