{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-55839","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","state":"PUBLISHED","assignerShortName":"GitHub_M","dateReserved":"2026-06-17T16:29:38.865Z","datePublished":"2026-08-18T15:27:18.261Z","dateUpdated":"2026-08-18T17:46:37.126Z"},"containers":{"cna":{"title":"Kestra: Stored XSS via custom Markdown [[link]] attribute injection","problemTypes":[{"descriptions":[{"cweId":"CWE-79","lang":"en","description":"CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')","type":"CWE"}]}],"metrics":[{"cvssV3_1":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":8.7,"baseSeverity":"HIGH","confidentialityImpact":"HIGH","integrityImpact":"HIGH","privilegesRequired":"LOW","scope":"CHANGED","userInteraction":"REQUIRED","vectorString":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N","version":"3.1"}}],"references":[{"name":"https://github.com/kestra-io/kestra/security/advisories/GHSA-34pm-923j-7wf8","tags":["x_refsource_CONFIRM"],"url":"https://github.com/kestra-io/kestra/security/advisories/GHSA-34pm-923j-7wf8"},{"name":"https://github.com/kestra-io/kestra/pull/16835","tags":["x_refsource_MISC"],"url":"https://github.com/kestra-io/kestra/pull/16835"},{"name":"https://github.com/kestra-io/kestra/commit/6c8e6d099ed172cbb6b003b7fb30b7bb1f8f710e","tags":["x_refsource_MISC"],"url":"https://github.com/kestra-io/kestra/commit/6c8e6d099ed172cbb6b003b7fb30b7bb1f8f710e"},{"name":"https://github.com/kestra-io/kestra/releases/tag/v1.3.24","tags":["x_refsource_MISC"],"url":"https://github.com/kestra-io/kestra/releases/tag/v1.3.24"}],"affected":[{"vendor":"kestra-io","product":"kestra","versions":[{"version":"< 1.3.24","status":"affected"}]}],"providerMetadata":{"orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","shortName":"GitHub_M","dateUpdated":"2026-08-18T15:27:18.261Z"},"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."}],"source":{"advisory":"GHSA-34pm-923j-7wf8","discovery":"UNKNOWN"}},"adp":[{"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-08-18T17:28:28.962947Z","id":"CVE-2026-55839","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"total"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"title":"CISA ADP Vulnrichment","providerMetadata":{"orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP","dateUpdated":"2026-08-18T17:46:37.126Z"}}]}}