kestra-io kestra up to 1.3.3 Description cross site scripting

Summaryinfo

A vulnerability was found in kestra-io kestra up to 1.3.3. It has been classified as problematic. This affects an unknown part of the component Description Handler. The manipulation leads to cross site scripting. This vulnerability is traded as CVE-2026-33664. It is possible to initiate the attack remotely. There is no exploit available. It is suggested to install a patch to address this issue.

Detailsinfo

A vulnerability, which was classified as problematic, has been found in kestra-io kestra up to 1.3.3. This issue affects an unknown code block of the component Description Handler. The manipulation with an unknown input leads to a cross site scripting vulnerability. Using CWE to declare the problem leads to CWE-79. The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users. Impacted is integrity. The summary by CVE is:

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.

The advisory is shared at github.com. The identification of this vulnerability is CVE-2026-33664 since 03/23/2026. The exploitation is known to be easy. The attack may be initiated remotely. It demands that the victim is doing some kind of user interaction. Neither technical details nor an exploit are publicly available. MITRE ATT&CK project uses the attack technique T1059.007 for this issue.

Applying a patch is able to eliminate this problem.

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Vendor

• kestra-io

Name

• kestra

Version

• 1.3.0
• 1.3.1
• 1.3.2
• 1.3.3

Website

• Product: https://github.com/kestra-io/kestra/

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Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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