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CVE-2026-33664— Kestra Vulnerable to Stored Cross-Site Scripting via Flow YAML Fields

Quick assessment

Affected
kestra-io kestra
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

kestra是Kestra开源的一个工作流自动化平台。 kestra 1.3.3及之前版本存在跨站脚本漏洞，该漏洞源于用户提供的流YAML元数据字段渲染时未进行清理，可能导致任意JavaScript执行。

CVSS 7.3 · High EPSS 0.34% · P25
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I. Basic Information for CVE-2026-33664

Vulnerability Information
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Vulnerability Title
Kestra Vulnerable to Stored Cross-Site Scripting via Flow YAML Fields
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
在Web页面生成时对输入的转义处理不恰当(跨站脚本)
Source: CVE Program / CVE List V5
Vulnerability Title
kestra 跨站脚本漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
kestra是Kestra开源的一个工作流自动化平台。 kestra 1.3.3及之前版本存在跨站脚本漏洞，该漏洞源于用户提供的流YAML元数据字段渲染时未进行清理，可能导致任意JavaScript执行。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
kestra-io kestra <= 1.3.3 -

II. Public POCs for CVE-2026-33664

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III. Intelligence Information for CVE-2026-33664

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Vendor Advisories for CVE-2026-33664 (1)

IV. Related Vulnerabilities

Same product: kestra
Same vendor: kestra-io
Same weakness: CWE-79

V. Comments for CVE-2026-33664

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