{"cve":"CVE-2026-55839","nvd":{"published":"2026-08-18T16:17:53.710","modified":"2026-10-22T22:10:00.250","status":"Deferred","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.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N","score":8.7},"cwes":["CWE-79"],"references":["https://github.com/kestra-io/kestra/commit/6c8e6d099ed172cbb6b003b7fb30b7bb1f8f710e","https://github.com/kestra-io/kestra/pull/16835","https://github.com/kestra-io/kestra/releases/tag/v1.3.24","https://github.com/kestra-io/kestra/security/advisories/GHSA-34pm-923j-7wf8"],"products":[],"source":"nvd","synced_at":"2026-10-23T16:39:26.291718493+00:00"},"epss":{"cve":"CVE-2026-55839","score":0.0043,"percentile":0.36969,"date":"2026-10-25"},"kev":null,"osv":[{"id":"GHSA-34pm-923j-7wf8","url":"https://osv.dev/vulnerability/GHSA-34pm-923j-7wf8","summary":"Kestra vulnerable to stored XSS via custom Markdown [[link]] attribute injection","modified":"2026-09-10T03:51:12.862150748Z","packages":[{"ecosystem":"Maven","name":"io.kestra:kestra","purl":"pkg:maven/io.kestra/kestra","ranges":["<1.3.24"],"fixed":["1.3.24"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}