{"cve":{"cve_id":"CVE-2026-55839","is_kev":false,"kev_date_added":null,"kev_vendor_project":null,"kev_product":null,"kev_vulnerability_name":null,"kev_short_description":null,"kev_required_action":null,"kev_due_date":null,"kev_known_ransomware":null,"kev_notes":null,"kev_cwes":null,"epss_score":0.00302,"epss_percentile":0.22823,"epss_as_of":"2026-09-15","description":"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.","published_at":"2026-08-18T15:27:18.261000Z","last_modified_at":"2026-09-16T13:42:45.297000Z","cvss_v3_score":8.7,"cvss_v3_vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N","cvss_v3_severity":"HIGH","cvss_v4_score":null,"cvss_v4_vector":null,"cvss_v4_severity":null,"ssvc_decision":null,"ssvc_exploitation":"none","ssvc_automatable":false,"ssvc_technical_impact":"total","cwes":["CWE-79"],"nvd_references":["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"],"vuln_status":"Deferred","trending_score":null,"is_trending":false,"has_trended":false,"trended_number_one":false,"trending_peak_score":null,"trending_peak_rank":null,"started_trending_at":null,"trended_number_one_at":null,"summary_generated":null,"summary_generated_at":null,"summary_model":null,"created_at":"2026-08-18T16:42:27.512677Z","updated_at":"2026-09-17T01:03:12.307245Z"},"effective_severity":"HIGH","badges":[],"impact_analysis":[],"cvss_v3_decoded":{"version":"3.1","metrics":[{"metric":"AV","name":"Attack Vector","value":"N","value_label":"Network"},{"metric":"AC","name":"Attack Complexity","value":"L","value_label":"Low"},{"metric":"PR","name":"Privileges Required","value":"L","value_label":"Low"},{"metric":"UI","name":"User Interaction","value":"R","value_label":"Required"},{"metric":"S","name":"Scope","value":"C","value_label":"Changed"},{"metric":"C","name":"Confidentiality","value":"H","value_label":"High"},{"metric":"I","name":"Integrity","value":"H","value_label":"High"},{"metric":"A","name":"Availability","value":"N","value_label":"None"}]},"cvss_v4_decoded":{"version":null,"metrics":[]},"affected":[{"vendor_slug":"kestra-io","vendor_name":"kestra-io","product_slug":"kestra","product_name":"kestra","version_start":"< 1.3.24","version_start_inclusive":true,"version_end":"< 1.3.24","version_end_inclusive":true,"cpe23_uri":"cve5:kestra-io:kestra:< 1.3.24:< 1.3.24"}],"exploit_refs":[],"news":[],"references":[{"url":"https://github.com/kestra-io/kestra/security/advisories/GHSA-34pm-923j-7wf8","source_type":"VENDOR_ADVISORY","tags":["advisory"]},{"url":"https://github.com/kestra-io/kestra/pull/16835","source_type":"PATCH","tags":["patch"]},{"url":"https://github.com/kestra-io/kestra/commit/6c8e6d099ed172cbb6b003b7fb30b7bb1f8f710e","source_type":"PATCH","tags":["patch"]},{"url":"https://github.com/kestra-io/kestra/releases/tag/v1.3.24","source_type":"PATCH","tags":["patch"]}],"timeline":[{"type":"published","at":"2026-08-18T15:27:18.261000Z","label":"CVE published","source":null},{"type":"ssvc_changed","at":"2026-08-20T03:43:27.527859Z","label":"SSVC decision revised","source":"vulnrichment"},{"type":"ssvc_changed","at":"2026-08-20T03:43:27.527859Z","label":"SSVC decision revised","source":"vulnrichment"},{"type":"ssvc_changed","at":"2026-08-20T03:43:27.527859Z","label":"SSVC decision revised","source":"vulnrichment"}]}