What is CVE-2026-33664?

CVE-2026-33664 is a high-severity vulnerability in Kestra, classified under Cross-site Scripting. CVSS score: 7.3/10. Published 2026-03-26.

How severe is CVE-2026-33664?

High severity. CVSS v3 base score is 7.3 out of 10.

XSS in Kestra

CVE-2026-33664

Kestra is an open-source, event-driven orchestration platform Versions up to and including 1.3.3 render user-supplied flow YAML metadata fields — description, inputs[].displayName, inputs[].description — through the Markdown.vue component…

Vulnerability class: XSS (Cross-Site Scripting)

EPSS: 0.003 (17.0th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.3 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:N.

Affected products

Kestra
Kestra-io Kestra — versions <= 1.3.3

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

security-advisories@github.com (x_refsource_CONFIRM, Exploit, Mitigation, Vendor Advisory)

Frequently asked questions

What is CVE-2026-33664?: CVE-2026-33664 is a high-severity vulnerability in Kestra, classified under Cross-site Scripting. CVSS score: 7.3/10. Published 2026-03-26.
How severe is CVE-2026-33664?: High severity. CVSS v3 base score is 7.3 out of 10.