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CVE-2026-55839

8.7 · HIGH

Kestra is an open-source, event-driven orchestration platform.

Published Aug 18, 2026CWE-79EPSS 0.43%

Overview

CVE-2026-55839 is a high-severity vulnerability. It was published on August 18, 2026 and has a CVSS 3.1 base score of 8.7 (HIGH).

This vulnerability has a CVSS 3.1 base score of 8.7, rated HIGH. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

GitHubgithub.com/kestra-io/kestra/commit/6c8e6d099ed172cbb6b003b7fb30b7bb1f8f710eGitHubgithub.com/kestra-io/kestra/pull/16835GitHubgithub.com/kestra-io/kestra/releases/tag/v1.3.24GitHubgithub.com/kestra-io/kestra/security/advisories/GHSA-34pm-923j-7wf8

How CyberStrike helps

Frequently asked questions

What is CVE-2026-55839?

CVE-2026-55839 is a high-severity vulnerability. It was published on August 18, 2026 and has a CVSS 3.1 base score of 8.7 (HIGH).

How severe is CVE-2026-55839?

This vulnerability has a CVSS 3.1 base score of 8.7, rated HIGH. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2026-55839?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-55839?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-55839 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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