Vulnerability 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 Score
HIGH
Related Weaknesses (CWE)
References
- https://github.com/kestra-io/kestra/commit/6c8e6d099ed172cbb6b003b7fb30b7bb1f8f7
- 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
FAQ
What is CVE-2026-55839?
CVE-2026-55839 is a vulnerability with a CVSS score of 8.7 (HIGH). 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 upda...
How severe is CVE-2026-55839?
CVE-2026-55839 has been rated HIGH with a CVSS base score of 8.7/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-55839?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.