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Vulnerability details

CVE-2026-33664

kestra-io kestra

Kestra Vulnerable to Stored Cross-Site Scripting via Flow YAML Fields

CVSS 3.1
7.3High

Official description

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 instantiated with html: true. The resulting HTML is injected into the DOM via Vue's v-html without any sanitization. This allows a flow author to embed arbitrary JavaScript that executes in the browser of any user who views or interacts with the flow. This is distinct from GHSA-r36c-83hm-pc8j / CVE-2026-29082, which covers only FilePreview.vue rendering .md files from execution outputs. The present finding affects different components, different data sources, and requires significantly less user interaction (zero-click for input.displayName). As of time of publication, it is unclear if a patch is available.

CVSS scores

ScoreVersionSourceVector
7.3High 3.1 CVEProject cvelistV5 (CNA) (GitHub_M) CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:N

Affected products

VendorProductVersionsSource
kestra-io kestra <= 1.3.3 CVEProject cvelistV5 (CNA)

References and advisories

1
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Details

Published
2026-03-27
Last updated
2026-03-27
State
Published
Assigner (CNA)
GitHub_M

Exploit prediction (EPSS)

0.26%
Probability of exploitation in 30 days
18.4%
Percentile (among all CVEs)

SSVC assessment (CISA)

Automatable
No
Exploitation
Proof of concept
Technical impact
Total

Weaknesses (CWE)

  • CWE-79
    Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')